Hey Sunil.

Yes, you will be eligible for a 3 year LLB course even if you have completed your Undergrad degree in 2011. There is no upper age limit to apply for 3 year LLB in most colleges.

As you've mentioned CLAT is one of the tags, you cannot apply for CLAT as it is an entrance test for admission in 5 year integrated law course which combines degree with law like BA LLB, BCOM LLB etc. As you've done BCOM already here is a list of various top entrance tests for 3 year LLB.

DU LLb- Delhi University

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

PU LLB- Panjab University,Chandigarh

TS LAWCET- Law colleges in Tamil Nadu

BHU LLB- Banaras Hindu University.

BVP LLB- Bharatiya Vidyapeeth University

LSAT- Private Law colleges like O.P. Jindal Global Law school, IIT Kharagpur etc

Best of luck