Kross Test Prep is a student-founded, affordable alternative to expensive SAT prep: original practice built from real experience, without the high prices that lock students out.
Here's what sets us apart:
Kross is run by an 18-year-old student from Varna, Bulgaria, who self-studied using only free resources and scored 1500 on the December 2025 Digital SAT (720 Reading & Writing, 780 Math). The packs are built around the mistakes he made and learned to avoid on the way.
Big-name companies charge premium prices for courses that many students simply can't afford. Kross packs cost €9 to €15 each, and all six together are €29, so no one has to give up good practice because of cost.
Every question comes with an explanation of the fastest route and the trap it's testing, plus the Desmos shortcut where one exists. Every question is written from scratch and solved twice before it goes into a pack.
Download a pack and start right away. Drill one skill at a time, work from easy to hard at your own pace, and finish with timed sets before test day. The Kross Tracker, coming soon, will keep your error log and bring back the questions you missed.
Everything is digital, so students in Bulgaria and anywhere else get the same packs the moment they buy. Whether you're aiming for steady improvement or a quick boost before your next test, the goal is the same: your target score at a low cost.
Draft, to be confirmed before launch.
If you find an error in a question or explanation, email us. We fix it and send the corrected pack to everyone who bought it, free of charge.
If a pack isn't right for you, email us within 14 days of purchase and we'll refund you in full to your original payment method.
You can cancel your Tracker subscription at any time. It stays active until the end of the period you paid for.
No charge, so nothing to refund. It's risk-free!
Questions? Contact us anytime before or after you buy.