Answer only mechanical engineers... Pls ans.

Pls tell me about your school life (class xi and xii). How you studied, what you used to do with out study.

It was just normal. Nothing special to mention.
Studied, went to club, played with friends, Went to restaurants, cinemas and all. Made much fun.
But whatever I learn , I learn by heart.
I owe my success to my Tuition Teacher, who used to have just 4-5 students in his batch for preparing them for Joint Entrance Exams. Success rate was always 100% year after year.
I also made it and opted for Mechanical Engineering. Presently I am at a Sr. managerial post in a Navaratna.

My last two years at public school was lots of math at various levels, chemistry, physics, and languages. Then I went to a four year college. My studies there was more of the same, along with literature, history, government, religion, biology, contemporary social problems, philosophy, art and architecture. The plan was to go there three years, and to an engineering university for two years, and get two degrees. But the war came along, the government would give me only four years for any degree. I changed to economics for the last year and got a degree with that field. Even my major professor, head of the faculty, could not believe what I had done in only a year.
I did not have time to do much more than that during school. I had to go into the navy to keep from going into the army.
After the military, I did some office work, some design jobs in the entertainment field, some technical jobs with electronics and optics, and taught computer software use in a few colleges.