Dear Venkat, considering the fact that you will join 12th class this Summer, you will have to take LSAT India for 5 year Integrated course. For this he basic eligibikity criteria is that youbshould have completed your 10+2 from a recognised board with a minimum aggregate of 50%. Because TOEFL and IELTS scores have a validity a certain no. of years, it is only normal yo think LSAT India might have one too. But they are Language proficiency tests and not entrance examinations. So if you want to take up LLB in 2020, you need to appear in 202 as a student appearing for 10+2 exams. You cannot appear for any entrance exam in advancre and freeze your scores for the next Academic year.