Hi Vidhi 

If you have your OBC certificate then you can claim a seat in under OBC category in that case your OBC rank will be used and if you apply for counselling under unreserved category then your CML rank will be used to allocate you a seat. 

You can use our college predictor tool to know about probable Colleges for your rank

https://engineering.careers360.com/cg-pet-college-predictor?icn=CG_PET_clgpd&ici=CG_PET_article_contmap