I have taken the ACT and SAT along with three subject tests. However, with all the schools I’m applying to, I’ve found that it’s best to submit my ACT and nothing else. Should I still mention the other tests on the common app itself, in the “testing” section?
Is the ACT your best score or is it the only required one (aka what do you mean by that you found it best?) ?
@patrickisastar I found it the best, and based on testing requirements for each school I don’t really need to submit the SAT and Subject Tests anywhere (as they weren’t nearly as good as my ACT and could reflect poorly).
@piedpiper72 Oh, then just the ACT should be just fine! It’s not required, so not having it should be no issue. And if they aren’t as good as the ACT, then just leave them be 
Unless you have a really good SAT subject test related to something you want to study, then really don’t use them. This is just my personal opinion, but if they’re not necessary or helpful, then why bother? It doesn’t seem like they’ll bring you any benefit.
On a second note, I hadn’t noticed I answered two threads by the same person xD. Cool, though.