Your question is fine. You often hear "Have you studied hard ?" "Have you crammed ?" "Have you revised all the material ?" "Do you think that you are ready ?" I think that the people asking the question are more concerned with your feelings about the exam, rather than the depth of your knowledge. Some other corrections. -------------------------------- When I ask someone who has prepared for an exam. Plz - you probably should use please , I know that this abbreviation is often seen but it is probably a bad habit to get into while learning.

something much better would be Have you studied hard?! Have you studied well?!

Yes, it's fine.