Manish, LLB is a 3 year Bachelor course which is pursued after 12th in any stream. It can be also pursued after B.Sc Mathematics but you cannot skip the first 2 years and then join the 3rd year directly. There is no such lateral entry option. This is because what you are taught in B.Sc Mathematics and what you will be taught in LLB are different and there is no similarity between these 2 courses as the outreach is also different. So should you be willing to take up LLB, you should start based on your 12th qualification and not on your B.Sc qualification. AP LAWCET, TS LAWCET, MHCET LAW are few entrance examinations that are conducted for admission to 3 year Law programmes. You can check the complete list of exams at our page: https://law.careers360.com/articles/law-entrance-exams