hi,

see most of the private and state government college wants 50% marks in 10+2, however every day competition is going really high.  if you want to study in  iits, nits, gftis, you need to have 75% marks in 10+2 course. so try to make marks in 12th course above 75%, then you will face no problem to get admission in any college. 11 marks dont matter for admission in engineering, but you should study well in 11th also , as exmas like jee main, jee advance, mahcet, ts eamcet has lots of question coming from 11th syllabus as well as 12th syllabus. so study hard.