Hi,

Even if you are not able to clear CLAT, be asssured that you'd be able to get through LSAT as the questions are based on English and Reasoning which aren't very difficult and the scores are percentile based.

Further, if you wish to apply for Alliance Law School, you can fill ACLAT application form which is the entrance exam conducted by Alliance Law School itself for admissions.

Moreover, the only law institute that you can get an admission on the basis of your 12th score is Tamil Nadu Dr. Ambedkar Law University.

All the best!