There are quite a few Engineering entrance examinations in India. Few of them are JEE Mains, JEE Advanced, MIT, BITSAT, AP EAMCET, KCET, TS EAMCET, WBJEE, COMEDK, etc. All of them need you to complete your 12th in Physics, Chemistry and Mathematics mandatory. The aggregate is different for each entrance examination but you need to complete your 12th. For example, to qualify for JEE Mains, there is no minimum aggregate criteria. But if you want to join NITs, IIITs or CFTIs then you should score a minimum aggregate of 75% only in your 12th. 11th marks aren't considered. And then to appear for JEE Advanced which is the gateway for admission to IITs, you will need to fulfill the 75% aggregate condition. Now it is 75% for General Category and 65% for Reserved Categories. So how much you score in 12th is what matters to secure your eligibility for NITs, IIITs, CFTIs and JEE Advanced. You can check the entire list of entrance exams in India for studying Engineering at our page: https://engineering.careers360.com/articles/top-engineering-entrance-exams-in-india . But the gist is that you need to complete your 12th. Without that, you cannot take admission in Engineering.