In the summer of 2020, together with a group of volunteers, we have organized an 8-week free practice for 4 different levels: Kangaroo (3rd grade), Pre-AMC (4th grade), AMC8+ and AMC10/12.
We would like to express our deep appreciation for volunteers Dr. Hongwei Gao, Dr. Zhiqin Lu, Ms. Mandy Meng, Ms. Zhen Tian, Dr. Zhaoxia Yu, and Tiger Zhang (12 years old) who have devoted numerous hours in making solution videos, which can be viewed as practice-based crash courses.
Our gratitude also goes to Michael Jian, Dr. Ji Li, Dr. Jiangang Yao, and Mr. Sean Zhang for providing some practice problems and helping check solutions.
Below are links to practice problems and solution videos:
This level is similar to the 3rd grade math Olympiad in China
This level can also be viewed as an entry to AMC8
Here we mainly focus on medium-to-difficult problems in AMC8
Here we mainly focus on medium-to-difficult problems in AMC 10/12.
Many problems in this practice can also be used to prepare for the first 10 problems of AIME.