https://collegereadiness.collegeboard.org/sat-subject-tests/subjects/science/chemistry has some online practice questions for the SAT subject test in chemistry.
If you will eventually take math level 2 (because you will complete precalculus and trigonometry by the end of 11th grade or earlier), then it is not really worth the trouble to take math level 1. Math level 1 is mainly for non-advanced-in-math students who will complete no higher than algebra 2 or equivalent by the end of 11th grade.