First of all make yourself utter sure how precious your life is! The moments hurting you right now will reward you in future. Pressure doesn’t come to you untill or unless you are ready to take it. Just don’t take it. Relax and just focus. 60,70,80 marks won’t matter to you at all. If you think you can’t score maximum, trust me its really fine. Learning life is the most important education and these marks will be just checkpoints on your background. Score average marks, learn music, play games, follow your passion. This is important! If there is no passion, it will eventually come out and u will realize it. Do 30 min walk in morning and evening and use less social networking sites during these days. Listen more and speak less. Just stay focussed. Trust me you will be fine. All the best.