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The eligibility criteria for integrated law course is passed 10+2 from a recognized board with 45-50% aggregate, the compulsory criteria of having specific subjects may vary as there are various combinations such as BA-LLB, BCom-LLB, BSc-LLB, BCA-LLB,BBA-LLB etc, there are many top entrance exams held for admission such as CLAT which is one of the most popular conducted at national level, apart from NLUs it's accepted by many private colleges, there is AILET conducted by NLU, (Delhi), there is also LSAT, SLAT, CULEE, BHU UET there are also state level entrance tests such as KLEE in Kerala, TS LAWCET in Telangana, AP LAWCET in Andhra Pradesh, MAH CET LAW in Maharashtra etc, there are also universities for which admission is based on the merit of the qualifying examination such as The Tamil Nadu Dr BR Ambedkar University, accordingly as per your choice of particular colleges you have to apply, for example if you're interested to appear for CLAT, application form is active at https://consortiumofnlus.ac.in/clat-2021/ , check out at https://law.careers360.com/colleges/ranking for top law colleges, for the  entire list of law colleges all over India, visit at https://law.careers360.com/colleges/list-of-law-colleges-in-india