Here are some colleges in Kolkata offering 3-Year LLB programs with relatively flexible attendance policies:

1. University of Calcutta : Offers a 3-year LLB program with some flexibility for working professionals. Confirm attendance requirements during admission.

2. Rabindra Bharati University : Offers a 3-year LLB with some flexibility, depending on circumstances.

3. NUJS (National University of Juridical Sciences) : Offers an Evening LLB program for working professionals with potentially more lenient attendance policies.

4. Surendranath Law College : Provides a 3-year LLB program, where attendance flexibility might be available for working professionals.

5. WBNUJS (West Bengal National University of Juridical Sciences) : Offers Evening LLB classes with more flexibility for working students.

It’s best to confirm attendance details directly with the colleges.