Dr. John Chung's SAT math or math 2 subject test ?

Test Preparation SAT Subject Test Preparation
1

Planning to take both the SAT and the Math 2 subject tests. Already scoring 700 but want to get 800. If I am planning to take both, which one is better ?

2

I found Dr. John Chung’s quite difficult than the actual test.

3

Sorry, I don’t understand the question