Sat subject tests importance in transferring

Hello College confidential,

I’m a freshman international student in one of the top 10 liberal arts and planning to transfer to an IVY for a various reason. The question I want to ask though, How important are SAT subject tests? I never took them when I applied to my college and I’m now not sure whether I should:

Take the SAT in next Jan and apply only with it?
Or take the ACT in FEB and some subjects tests in JAN instead which is going to cost me A LOT of money.

I want to apply to MIT but it requires subject tests for transfers. Other Ivies, don’t mention anything about subject tests.

What do you think?

I really doubt the importance of SAT math 1 or 2 when I have an A on my calculus and linear algebra classes, don’t you think?

If I’m not mistaken, MIT doesn’t accept the ACT for transfer students, and they -require- subject tests, one of which in Math I or II.

Yes it does. But my questions are, what about the other ivies? and is it worth it going for an ACT?

any wise person?