The meanings of "may want" and "may wish" are essentially the same but, as Mister Micawber indicated, "may wish" is politer and more tentative than "may want."
Sorry, I am still confused about the exact meaning of " may want " here.
Candidates may want/wish to ask examiners for note paper to write on . Does this sentence mean that Candidates are allowed to ask examiners for note paper to write on .
[may / might] [want / wish] to ... can be used to make a gentle suggestion that it would be a good idea to .... As such, it has a family resemblance to these sorts of expressions: You would do well to ... It would be a good idea for you to ... You probably should ... ___ On the other hand, the same expression can be used more literally