Hello, Rahul
  First of all GOBCS stands for GENTS OBC CATEGORY STUDENT. A 505 OBC rank definitely means your GOBCS rank is somewhere close near 400 with a fluctuation of 25.

Hello

The GOBCS stands for the GENTS OBC CATEGORY CANDIDATE . Your GOBCS rank must be around 350-400. You can visit https://www.careers360.com/mht-cet-college-predictor for more information . You can also checkout https://bsfsos.com/be-btech/mht-cet/17302/17486 . All the best.