<p>Only a few schools would look beyond the required SAT2 scores. It may be helpful to take many SAT2 if you are homeschooling or applying to schools that use SAT2 scores in place of SAT1/ACT for admission. Otherwise, additional SAT2 scores are not even as useful as AP scores which also have little wait in admission. You would better to get 2 or 3 800 in SAT2 of required subject than diluting your effort. Once you fulfilled the requirement, it is better to use your time to improve your other credential such as EC than preparing and taking 10 extra SAT2 tests. SAT2 is not popular outside of the US. Many international students became aware of it when they are filling the application for certain schools. IB or other tests would be more useful in comparing students globally.</p>