Dear Mother,
Thank you for always supporting me without any conditions.As your son (or daughter) I'd like to appreciate your kindness by this letter.As the exam is near,I hope you can understand my stressful condition and communicate with me with encouraging words.Also,please give me some personal space before my exam.I can adjust myself well before the test because I know my own study progress very well.Furthermore,I studies very hard during the whole year and prepare for the exam so I'm very confident.Finally,I study a lot with my classmates who give me lots of suggestions.I think with those helps above I can do while during the exam.So please do not worry for me.
Love you all.