hello harsh..

70 percentile is a good perccentile for your category, you can easily clear the jee mains cutoff and will be qualified for the jee advanced examination. according to the expected cutoff for this years jee your category cutoff comes about 54.01 and yours is well on lead. you can hope to get admission in best institution of our country such as the nits moreover the well preferred private institutions for scholarship based education too...

hope this helps you

all the best