India

12 th class does not matter for 3 years LLB course after graduation degree in majority of Universities.
The eligibility criteria for admission to 3 years LL.B. Degree course in majority of Universities is as follows:
(a) For General candidates, Graduate/ Post-Graduate Degree from Indian or Foreign University recognized as equivalent by the University with at least 50% marks or an equivalent grade point in the aggregate in either of them.
(b) For other backward classes (OBC) candidates, Graduate/Post-Graduate Degree from any Indian or Foreign University recognized as equivalent by the University with at least 45% marks.
(c) For Scheduled Caste/Scheduled Tribe (SC/ST) candidates, a Graduate/Post-Graduate Degree from Indian or Foreign University recognized as equivalent by the University with at least 40% marks. ( As per Bar Council of India requirements )
(d) Relaxation of 5% marks in the minimum eligibility prescribed for general candidates is p allowed to widows/wards of ex-servicemen as prescribed and wards of serving personnel (CW) category who are in receipt of Gallantry awards.
(e) Relaxation of up to 5% marks in the minimum eligibility prescribed for general candidates is allowed to the candidates belonging to physically handicapped (PH) category.

Getting admission in Harvard University for engineering: If you are applying outside the United States then you are considered as an international applicant, but the procedure to get into the Harvard University for engineering is same as the student of United States.
For admission in Harvard University, the main thing is the required standardized test scores in either SAT or ACT. Normally, you are required to take two SAT subject tests.
That can be English and mathematics.
Strong English proficiency is also tested by Harvard University and for that, you need to take TOEFL exam.
After you have cleared the cut-off to enter the Harvard University, they have a provision of taking an interview of the candidate.
If you believe you need a financial aid then you need to fill it in the form that you need financial aid from the Harvard University they will check and factor many things and consider that you are eligible for financial aid.
If you are not selected for financial aid program, it will not affect your candidacy.