I have 51% in my btech 86% in 10th and 71% in 12th i completed my btech in 2013 after that i worked now i want to go us for masters in mechanical engineering please tell me which college/ university will accept me
Well, we do NOT advise on schools here. You will need to do your own research. Usually 10th and 12th are not considered by US schools for admission decision. Looking at your percentage, I feel that you need to get some good scores in GRE and TOEFL to get admission from a decent school.