A score of 136 out of 300 in the Joint Entrance Examination Main (JEE Main) is considered to be a good score, and your final percentile may vary in the range of 90 to 95/96 according to the marks vs percentile data of previous years.

With this percentile, your rank may vary from 40,000 to 80,000, and with these ranks, you may easily be able to gain admission in some of the very good CFTIs in the branch that is desired by you.

Hope I have answered your question. All the best!