Yes, mazing is right, can you still withdraw from the two subject you aren't doing well in? Switch to just auditing them or something like that? See if you can at least finish this semester with some little bit to show. I went to grad school and dropped out after the first semester but I at least finished the one semester well in case I decided to change my mind later. I've done it the other way too, finished poorly and gone back and done well but that takes awhile and lots more work to learn