Krishna, did you know that stress decreases performance? Mental stress is one of the key factors correlated with concentration and thus academic or physical performance. Stress is a "disabling" symptom that reduces motor abilities and emotional abilities in a person. Acknowledging the fact that you are stressed is the first step towards improving your ability to destress and maintain calm composure so as to let things fall in place. Now there are always few aspects of life that you cannot change no matter how hard you try. Those things, though they hit you hard, need to be ignored and moved on upon. How much ever people might say to have a positive attitude, it is difficult when the odds are against you. In such situations, accepting the reality atleast makes you stronger to accept the issue at hand. There are quite a few a compensatory techniques that might actually divert your mind and help you destress. Exercise, Meditation, picking up a hobby, deep breathing, getting enough sleep are few techniques. But speaking to someone who can listen to you and not judge you is also important because you need to let out the emotion. If you do not have someone whom you can trust, the best part is to talk to a mirror, vent out your feelings, let out the anger, frustration and stress. This might actually help because you are letting out your emotions that are hurting you and causing you stress.

Hello,
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Mental Stress is one of the major issue in each and every one's life and you need not take any special instructions for reducing it.
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Just do what gives  you relief. Watch some funny things, spend some time for exercise. Exercise is one of the best way to get relief from stress.  If you aren't so interested in exercise go for meditation. It controls your emotions
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Don't go for depression, anxiety , irritability which can increase your mental illness. Avoid your bad habits if you have.

The best and effective way to reduce stress is to practice Yoga regularly. Maintain a healthy and well balanced meal. Do exercise on a daily basis to improve your sleep quality. Aromatherapy also helps in reducing stress and anxiety. Use essential oils or burn a scented candle to reduce stress.