For some engineering programs - schools often state they need 2 subject tests, preferably 1 maths and 1 science. In this case - it would be compulsory to take the SAT test right, since you can take the subjects tests without?
Would one take the ACT test in the hopes of a better score then?
But can you take the ACT test over the SAT test, and when they require SAT subject tests? Like can the ACT be in substitute of the SAT + 2 subject tests? If so how can I find this information.
EDIT: did some research and found that sometimes ACT can be taken in lieu of SAT+subjects, but some such as Harvard requires SAT subject tests.