Upvote:4
Here's an official procedure you need to follow in a nushell.
You cannot study on B1, so the first refusal was straightforward.
For F1 as you didn't mention a specific college/school/university you were going to, I assume you just wanted to go to US and then look around the colleges to study in. This is not how F1 visa works, you need to be admitted first before you apply.