history: I studied really hard for my exam, and I think I'll do well. I put weeks of work into it, so I am pretty sure I know the material I studied really hard for my exam_comma_ and I think I'll do well!
current: what kind of exam is it , and you sound confident you got this 
next: It's actually a Master's exam so it covers a lot of material, but I do feel I learned it well and am confident in my abilities