一类：
There is no denying that life is a mixture of laughters and tears. As far as I am concerned, the exam can cultivate your confidence and ability. To keep a positive attitude towards it, you'll find it easy to overcome. Only by this way can you prove yourself. As a saying goes,'There is no royal road to learn'. I know this exam is of great importance to you. Don't be so frustrated. To put what you have learnt into practice and devote your leisure time to studying little by little, you'll be delighted to find others speaking highly of you. As a saying goes,‘Life is like a box of chocolate, you never know what you are gonna to get.' I wish you to pursue your extraordinary success. By the way,I believe that this exam is not only significant, but also magnificent!
Every challenge has two results, failure or success. The result of the coming exam isn't that important to you, for it's just an inevitable answer to prove how hard you have worked this semester. If you do everything that you can do perfectly and excellently, there’s nothing to regret even if you get a failure in the end. Betty, please try to relax yourself when feeling so anxious and nervous that you can’t concentrate on the things you're dealing with. Do whatever you love, such as listening to the music or going out for a jogging. Try your best to overcome obstacles and persevere in achieving you goal.
I always believe you're the best!
二类：
I am your friend Joe. There is a coming exam. Don't upset about it for you cares too much about the result. You can go outside to have some sports to relax yourself. Don’t think this exam is difficult. Please take a deep breath to calm yourself down. In my opinion, all exams are easy enough for you to get good marks. I firmly believe you are the best!don't care too much about the result. Believe yourself, Betty!
三类
Betty, you needn't upset about a coming exam for she cares too much about the result, if you work hard, you will became better, if you don't hard-work, you will became worse, so you needn't worry about, I give you some advice, you should more hard-work, you should don't watch TV in weekends, you should go over. I think you become better.
四类
Don't upset about a coming exam for you cares too much about the result. The exam is no diffcult, it is easy. Why? Because you must study all, it is you knew, By the way, the exam is comed, you upset it, the exam is also. So you don't upset about a coming exam for you cares too much about the result. You should like me, don't you?