Hi Ratnakar,
As this year you've just passed class 10th it becomes important that you choose your subjects wisely according to your area of interest, in class 12th because your future will be directed from class 12th onwards.if you are really interested in pursuing engineering then your sole target should be jee.for that you need to be serious in your class 11th and 12th.only the clear concepts of 11th and 12th can fetch you success in jee.do start now, concentrate on each and every topic and don't ignore the board exam preparation.that is important too.
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