ChemiLearn (ХемиЛёрн)

This app is designed for independent additional preparation for the Unified State Exam, Basic State Exam, All-Russian Testing (VPR), and other chemistry exams.
The material is divided into logical blocks and corresponds to the school curriculum and exam codifiers.
A variety of tasks. Practice tests, exam-style tasks, computational and qualitative problems, transformation chains, matching tasks, and multiple-choice tasks. You can practice individual topics or solve full-length trial versions.
Step-by-step solutions and error analysis. Each task comes with a detailed solution and an explanation of why the answer is correct. If you make a mistake, the app will show you the problem and remind you of the relevant theory.
Adaptive learning system. The app analyzes your results and suggests tasks to help you close any gaps. You'll see your progress across topics and can focus on your weakest areas.
Timer and exam mode. Practice in conditions as close as possible to the actual exam: solve timed problems to learn how to manage your time effectively. Statistics and reports. Track your progress: percentage of correct answers, topic dynamics, number of problems solved, average time per task. This will help you objectively assess your exam readiness.
Offline access. The app is available without internet access, so you can study on the go, during breaks, or anywhere convenient.
The unique design promotes a positive learning experience.
Suitable for:
Students in grades 8–11 who need to brush up on their chemistry and understand complex topics.
Those preparing for the Basic State Exam (USE): the app will help you systematize your knowledge and learn how to solve common problems.
High school students aiming for a high score on the Unified State Exam: the app includes advanced tasks, calculation problems, and advanced topics.
Students facing the All-Russian Assessment (VPR) and other tests: a quick review of key topics and practice with common problems.