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DET Prep Guide · Updated July 2026
Best Duolingo English Test Prep (2026):
Why I Recommend Arno
✔ Save 15% on your DET exam
✔ Get 10% off Arno’s learning program
✔ Arno vs. Other Platforms — honest take
✔ Clear steps for getting the Arno first-purchase discount
If you are preparing for the Duolingo English Test, you have probably already noticed that prep platforms are everywhere. Some are useful. Some are not worth your time.
I have been teaching DET prep for a while now, and the same question comes up constantly: which platform should I actually use?
This post gives you my honest answer — how to save money on the exam itself, which prep platform I recommend and why, and two more options worth knowing about.
Before you read further
Get an extra 10% off your first Arno purchase through my referral link
If you are planning to sign up for Arno, use my referral link when creating your new account. The 10% first-purchase discount is tied to the account created through the referral link, so it is not automatically applied to an account that was already registered.
Arno — Extra 10% Off First Purchase →
https://duolingo.goarno.io/?referralCode=SAM5911
If you already have an Arno account, log out first. To receive the first-purchase discount, use a new email address that has never been registered with Arno, then create the new account through the referral link.
Already have an Arno account?
The referral link will not automatically apply the first-purchase discount to an email address that is already registered with Arno. Instead, log out and use a new email address — Gmail is recommended — to create a new Arno account through the referral link.
1 Save on the DET Exam Itself
Before we get to prep platforms, here is something most students miss entirely. You can save money on the official Duolingo English Test exam before you register — through two platforms that sell official exam coupons.
Arno
15%
Purchase an official DET exam coupon through Arno, then use it to register for your official DET exam. Pay up to 15% less than the standard price.
✦ Includes 24-hour results delivery option
Get coupon via Arno →
https://duolingo.goarno.io/?referralCode=SAM5911
DETpractice
10%
DETpractice also sells official DET exam coupons at a 10% discount. Convenient if you are already using DETpractice for mock test prep.
The Practical DifferenceArno gives you 5% more off the exam plus the 24-hour results package. If you are deciding between the two on exam discount alone, Arno has the edge. For Arno’s learning platform, the first-purchase discount is available when you create a new account through my referral link.
2 What Is Arno?
Arno is a DET-specific prep platform built around AI-powered feedback and structured learning. Everything on the platform is designed specifically for the Duolingo English Test — not a generic English tool. New users can currently explore the platform in a one-day free mode, including mock tests and other content. During signup, you may be asked to choose between Student Mode and Teacher Mode and answer a few setup questions.
One-Day Free Access
Arno currently offers a one-day free mode. During that free period, you can try a wide range of Arno content, including mock tests, before deciding whether the platform is right for you.
Section-by-Section Practice
Drill individual sections without sitting through a full test every time. Useful when you know exactly which area needs the most work.
AI Feedback on Writing & Speaking
Submit your written and spoken answers. Arno gives you specific, actionable feedback — not just a score. If something needs to be rewritten or rephrased, it shows you how. This is what actually moves your score.
Personalized Study Plan
Based on your performance, Arno builds a study plan and recommends which question types to focus on next. It adjusts as you improve — no more random grinding.
Unlimited Mock Tests in Package
Arno’s paid packages include unlimited mock tests alongside all other features. Everything is bundled into a time-based subscription — you are not buying tests one by one.
Clean, Intuitive Design
Arno’s interface is clean, well-organized, and noticeably easier to navigate than most DET prep tools. Less time figuring out the platform means more time actually studying.
Arno
Sam’s #1 Recommendation for DET Prep
Start with Arno’s one-day free access — no payment needed. During the free period, you can explore the platform and its content, including mock tests. If it feels right, create a new Arno account through my referral link to get an extra 10% off your first purchase. If you already have an Arno account, the referral link will not automatically apply the first-purchase discount; use a new email address that has never been registered with Arno.
Start Free Access →
https://duolingo.goarno.io/?referralCode=SAM5911
3 Arno vs. Other Platforms
Most DET prep platforms give you practice questions and a score. That is useful, but it is also where most of them stop. You finish a set, see 70% correct, and have no clear idea what to fix or how.
Arno goes further. The AI feedback on Writing and Speaking makes the biggest difference for most students — because vague feedback does the least good in those sections. Arno tells you specifically what to change and gives you a revised version to work from.
The personalized study plan is something most platforms simply do not offer. Instead of deciding yourself what to practice next, Arno tracks your performance and tells you where to focus. That structure matters — especially when pushing past a score plateau.
And in terms of design, Arno is genuinely cleaner and more intuitive than comparable tools. Reduced friction means more consistent study sessions.
4 Also Worth Knowing: DETpractice
If your main goal is mock test practice specifically — buying individual tests without committing to a full package — DETpractice is worth a look.
DETpractice
Mock Test Specialist · Buy individually or in bundles
DETpractice is specialized for mock test practice. Purchase tests individually — starting from a single test — or buy them in multi-test bundles. Every question comes with detailed feedback so you understand what you got wrong and why.
Arno vs. DETpractice — which fits you?
Arno is an all-in-one platform: study plan, AI feedback, section drills, and unlimited mock tests bundled together. If you want everything in one place with a structured path, Arno is the better fit.
DETpractice is mock-test focused. If you have already done most of your prep and just want to simulate the real test several more times before exam day, it is a practical, lower-commitment option.
And as mentioned above — DETpractice also sells official DET exam coupons at 10% off, so you can handle your exam purchase and mock test prep in one place.
Check out DETpractice →
https://www.detpractice.com?code=175
Arno vs. DETpractice — which fits you?
Arno is an all-in-one platform: study plan, AI feedback, section drills, and unlimited mock tests bundled together. If you want everything in one place with a structured path, Arno is the better fit.
DETpractice is mock-test focused. If you have already done most of your prep and just want to simulate the real test several more times before exam day, it is a practical, lower-commitment option.
And as mentioned above — DETpractice also sells official DET exam coupons at 10% off, so you can handle your exam purchase and mock test prep in one place.
5 Also Free: The Official Duolingo Practice Page
Before spending anything, there is one more resource worth knowing about — and it costs nothing.
Duolingo Official Practice
Always free · Always current · Always official
Duolingo’s official website includes a free practice section where you can try actual DET question types. The number of available questions is limited, but the content is official — always up to date.
This matters because the DET question format does occasionally change. When it does, the official practice page is the first place those changes appear. Third-party platforms take time to catch up. Duolingo’s own page does not.
How to use it: if you hear that the DET has updated a question type or introduced something new, check the official page first. Get familiar with the new format there, then go back to your main prep platform for volume and feedback. Think of it as a free supplement — not a replacement for structured prep, but a reference point that is always current.
Visit Official Practice Page →
This matters because the DET question format does occasionally change. When it does, the official practice page is the first place those changes appear. Third-party platforms take time to catch up. Duolingo’s own page does not.
How to use it: if you hear that the DET has updated a question type or introduced something new, check the official page first. Get familiar with the new format there, then go back to your main prep platform for volume and feedback. Think of it as a free supplement — not a replacement for structured prep, but a reference point that is always current.
6 How to Get the Most Out of Any Platform
1
Do the free mock test first. Both Arno and DETpractice offer one. Take it under real conditions — timed, no breaks, no looking things up — and use your results to identify your weakest sections before spending anything.
2
Do not just practice. Get feedback. A score tells you where you are. Feedback tells you how to move. Arno’s AI feedback on Writing and Speaking is the clearest example of this done well.
3
Follow a structure. Random practice without a plan is the slowest way to improve. If you use Arno, let the study plan guide your sessions. If you use DETpractice, review every piece of feedback after each mock test.
4
Check the official page when the DET updates. Question formats change occasionally. The Duolingo official practice page is the fastest way to see what is new before your prep platform catches up.
7 FAQ
Is Arno worth it for Duolingo English Test prep?
Yes — especially if you want AI feedback on Writing and Speaking, a personalized study plan, and unlimited mock tests in one package. The free mock test lets you try before you commit.
Can I really save 15% on the DET exam through Arno?
Yes. Arno sells official Duolingo English Test exam coupons that give you up to 15% off the standard exam price. The package also includes a 24-hour results delivery option.
What is the difference between Arno and DETpractice?
Arno is an all-in-one prep platform — study plan, AI feedback, section drills, and unlimited mock tests in a time-based package. DETpractice is mock-test focused — buy individual tests or bundles with detailed feedback on every answer.
How do I get the extra 10% off Arno?
Create a new Arno account through the referral link on this page: https://duolingo.goarno.io/?referralCode=SAM5911. The first-purchase discount is tied to the new account created through the referral link. If you already have an Arno account, log out and use a new email address that has never been registered with Arno.
I already have an Arno account. Can I still get the first-purchase discount?
The referral link will not automatically apply the first-purchase discount to an email address already registered with Arno. Log out, then use a new email address — Gmail is recommended — that has never been registered with Arno. Create the new account through the referral link. During signup, seeing the Student Mode or Teacher Mode choice and the usual signup questions indicates that the new registration process has started normally.
Is there a free option for DET practice?
Arno currently offers one-day free access, during which you can use a range of Arno content including mock tests. DETpractice offers one free mock test. The official Duolingo practice page at englishtest.duolingo.com/home is also free, always current, and useful for checking new question formats.
8 Quick Summary
Everything You Need to Know
✓Save up to 15% on the DET exam — buy your official coupon through Arno before you register
✓Save 10% on the DET exam — also available through DETpractice
✓Get 10% off Arno’s first purchase — create a new Arno account through my referral link
✓Arno — all-in-one platform, AI feedback, study plan, unlimited mock tests, clean design
✓DETpractice — mock test specialist, buy individually or in bundles, detailed feedback
✓Duolingo official practice — always free, always current, best for checking new question formats
✓Already have an Arno account? Log out and use a new email address that has never been registered with Arno to receive the first-purchase discount through the referral link
9 Get Started
Arno — One-Day Free Access + Extra 10% Off First Purchase
All-in-one DET prep · AI feedback · Study plan · Unlimited mock tests · One-day free access
https://duolingo.goarno.io/?referralCode=SAM5911
›
DETpractice — Mock Test Specialist + 10% Off DET Exam
Buy individual tests or bundles · Detailed feedback included
https://www.detpractice.com?code=175
›
Duolingo Official Practice — Free
Always current · Best for checking new question formats
https://englishtest.duolingo.com/home
›
Existing Arno users: the referral link will not automatically apply the first-purchase discount to an account you already have. Log out and use a new email address that has never been registered with Arno to create a new account through the referral link.
Disclosure: This post contains affiliate links (rel="sponsored"). If you purchase through my links, I may receive a small commission at no extra cost to you. I only recommend platforms I genuinely use and trust for DET preparation.
© 2026 DETnT (DETntedu.com). All rights reserved. Written by Sam.
Total or partial reproduction of this content without clear attribution is strictly prohibited and subject to Google DMCA takedown.
Total or partial reproduction of this content without clear attribution is strictly prohibited and subject to Google DMCA takedown.
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