Hello pushpa.

The CBSE is a national education board for public and private schools,managed by the union government of India while the state board is governed by the concerned State government.Well, according to me ,it doesn't makes that big difference if you do your class 10 from state board or cbse but for class 12 ,I would suggest CBSE definitely.This is because after class 12, whichever competitive exams you give,most of them are based on CBSE curriculum.So doing your class 12 from CBSE will give you a higher edge.One other option is that till class 10 you can go for ICSE and then your +2 from CBSE.

Hope this helps you with your doubt.Good luck!