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
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