There are no other subject tests relevant to courses he is taking now?
If he wants to practice, The College Board has free online practice questions: https://collegereadiness.collegeboard.org/sat-subject-tests/subjects/mathematics/mathematics-1
There are no other subject tests relevant to courses he is taking now?
If he wants to practice, The College Board has free online practice questions: https://collegereadiness.collegeboard.org/sat-subject-tests/subjects/mathematics/mathematics-1