Hello student if you're going to pursue BSc +MCA +Mtech you need to invest your 3+2+2 =7 years on the other hand if you pursue B.tech +Mtech you need to invest only 4+2=6 years only.

Also B.tech is more preferable among students as it's a technical and professional course.

ELIGIBILITY - Candidates must passed or appearing class 12 in physics chemistry and mathematics from a recognized board.

However in some institute there's minimum percentage criteria.

Feel free to comment if you've any doubt.

Good luck