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Taking notes is always a good memory booster.

You HEAR what the teacher says,SEE what the teacher writes and you also SEE what you write down.You have impressed the new information a little more solidly into your memory then it would have been if you were just sitting and listening.

Going back and looking over your notes later that evening will be a good refresher also.

Don't regret your self .Try to do lot of practice you will be fine.Eat fresh vegetables.Think positive every time.it will help a lot.