Hey.

CLAT is an entrance test for admisssion to NLUs or National Law Universities are law colleges that provide five year integrated courses of Law. CLAT UG is for 5 year law courses and CLAT PG is for Masters in Law ie LLM which you cant pursue unless you have an LLB degree.

There are 2 types of Law courses in India- 3 year LLB course and 5 year integrated law course. 3 year law courses are for those who have completed their Undergraduation. So after completion of any 3 years of Undergraduate course, you can do LLB which will be for 3 years. Hence It would take 6 years if you start with a separate UG degree. And in 5 year law course are for those who are seeking to puruse law after class 12th. It combines an Undergraduate degree with law, for example- BA LLb, BCOM LLb, BBA LLb etc. It takes 5 years after 12th class.

Admission in Nlus is through entrance called CLAT.

NLUs offer only 5 year law courses through CLAT. Though you will be eligible to apply for NLUs even after graduation but it will lead to you wasting 2 years. You'll have to do a graduation degree again and it will take you 5 years to complete law where you can easily compelete it in 3 years. So after graduation 3 year LLB is more suitable. Admission to various colleges is done through their own entrance exams or procedures. Here is a list of law entrances for 3 year LLB course -

DU LLB - Delhi University

MH CET- GLC mumbai, ILS Pune and other colleges in Maharashtra

SLAT- Symbiosis Law school

PU LLB- Panjab University, Chandigarh 

LSAT- Jindal global Law school, IIT Kharagpur and other private law colleges

BHU LLB- Banaras Hindu University

BVP LLB- Bharatiya Vidyapeeth

TS LAWCET Etc

Best of luck

PLZ read CLAT form 2019

Dear student you pursuing graduation this year is your last year so why you question arising you confused about you choose ug or pg already you attend last exam in June so you can also go to pg and you have graduation course which course you doing you tell me then I tell you pg eligibility craeteria so you better understand.