As for laptops that can transform into tablets, I guess this makes more sense to have touch-screen anyway.
By the way are you saying that you can not type in class using a keyboard? Is there a reason for that?
I can type in class if I wanted too (Though, typing it a bit loud, it'd be kinda annoying for my other class-mates). The issue is actually entering in my notes. For example, this summer I took Linear Algebra, and most of the class involves lots and lots of matrices. It's easy to write them on paper, but setting up the formatting correctly to have something readable on the computer is easier said then done. There were also a few classes where we had examples involving drawing two ovals next to each-other with dots inside and then drawing lines between the dots. I'd simply be fussing with my computer to much to actually pay attention and get all the information down when trying to draw out stuff like that. Using a simple notepad is just hands-down better. A tablet interface with a pen would be perfect though, because I could write all my notes down just like a note-pad into the computer, and then go back and reorganize them fairly easily.
I'd rather just buy a laptop that can fold into a tablet because I have no real need or want to have two separate devices considering I probably won't use tablet mode that much.