Cousin has prob with recalling during exams. she says that her brain just blocks. is there anything she can take in order to her recall better?

See below: There's lots of books, classes and exercises that can increase her test-taking ability.

A common problem: There is not much that she can do but exercxise her ability to relax. One of the best and oldest is meditation on a daily basis. All you have to do is to allocate a time of day and sit quietly in a quiet room. Pick a mantra such as a word that describes sometrhing beautiful and focus on it. It does not come easily---takes practice but that applies to anything worth while.