Hello aspirant

Hope you are doing great . If I consider the level of difficulty of your shift to be moderate , then for 60 marks you will get an approximate percentile of about 82.26 - 85.52 . But this percentile can differ if NTA considers your shift to be easy . If luck favoures you , then definitely you will be able to appear in jee advance and since you belong to OBC category there are high chances for you to be able to clear jee mains cut off.  So yes you can start preparation for jee advance

I hope my answer helps

Wish you all the very best!