hello debra. you need to ask yourself WHY you are striving for all this (whatever the 'this' is). are you striving for YOU and your expectations of yourself - or are you striving to complete someone else's expectations? many times, stress comes from doing things you think are expected of you but not actually what YOU want to do. do you actually like what your future will be? are the exams REALLY that important to YOU - or to others who deem them important so that you can further your career in what is expected of you?
suppose your father is a chemist and you feel you ought to follow in his footsteps - but actually you yourself would love to be a writer. you must decide who is more important - your dreams or your father's. if you put someone else's dream before your own, you , probably , will always be stressed and sad. i wish you well and hope you find a vocation YOU enjoy.