hi shivam,

I think you got this 60% marks in your B.Tech. Its alright. You may not get into Google directly unless you belongs to top tier engineering college and have amazing coding profile. Join some startup or some less paying company don't be at home after B.Tech. Learn!! Learn!! Learn!!.Knowledge is the power shivam. Top software companies wants great knowledge of DS + Algo. Learn some new technologies like data science, machine learning, etc and be good at DS + Algo.

Get into competitive programming to improve DS + Algo in competitive programming websites. Prepare for interviews before sitting for any interview on various interview prep websites on internet. You can only get into Google or other top software company with hard work only.

I hope this answer will help.
All the best for the future!!