Would You MakeNationals?
Find out before exam day. Realistic USNCO mock exams — scored instantly, with step-by-step explanations and topic-by-topic analytics that show exactly what to fix next.
600+ original questions by Dr. Chen's team • USNCO scope, format & difficulty • All 10 chemistry topics
From the program behind 3 of the 4 members of 2026 IChO Team USA
Why Choose Us
USNCO-Style Mock Exams
Authentic practice that mirrors the real competition experience
Original Questions
Written by Dr. Chen and his team with years of USNCO coaching experience.
USNCO Format
Same scope, style, and difficulty as the real competition. 60 MCQs in timed format.
All 10 Topics
Complete coverage from atomic structure to organic chemistry and biochemistry.
Detailed Explanations
Every question includes thorough explanations to help you learn from mistakes.
Study Tools
Prepare Like the Competition
Tools designed specifically for USNCO preparation
Timed Mock Exams
Simulate real competition conditions with Local (110 min) and National (90 min) exam formats. Build time management skills under pressure.
Topic Drill
Focus on specific chemistry topics to strengthen weak areas. Practice atomic structure, thermodynamics, kinetics, organic chemistry, and more.
Performance Analytics
Track your progress by topic and difficulty. Identify strengths and weaknesses to focus your study time effectively.
Rich Chemistry Content
Questions with properly formatted chemical formulas, reaction equations, molecular structures, and diagrams.
See the Platform in Action
Score breakdowns, step-by-step explanations, topic analytics, and review tools — everything you need after each mock exam.
Score Overview—Detailed results with score breakdown
AI-Powered
Learn Smarter with AI
Get instant, intelligent explanations to understand chemistry concepts deeply
AI Explanations
Detailed explanations for every question to help you understand the chemistry behind correct answers.
Instant Feedback
Learn from mistakes immediately with explanations that appear right after you answer.
Expert Verified
All explanations are reviewed by Dr. Chen's team to ensure accuracy and educational quality.
Understand the "Why"
In chemistry, understanding why a reaction occurs is more important than memorizing what happens. Our explanations provide the reasoning and mechanisms behind every answer.
Know Where You Stand — Before the Real Exam
One free mock exam tells you more than a month of passive review: your score, your weak topics, and exactly what to study next.
From Dr. Chen's Academy • 10+ years of USNCO coaching experience