Hey Abhinandhana.

 See the cut off for the JEE ADVANCE for the OBC category is 84% and u are below than that which means u are not eligible to take the exam. U should be going for the NITs and other good govt colleges for ur higher studies in the field of ur interest under btech courses. I m providing u a link for ur help

https://www.googleadservices.com/pagead/aclk?sa=L&ai=DChcSEwiHgcC_5_XhAhVBGo8KHe7vB-UYABAAGgJzYg&ae=1&ohost=www.google.com&cid=CAESEeD28DPX4aFaY4z1m7ym8Xd9&sig=AOD64_0msDb1_rxjqt9ySQzIOJQeFDQXDg&q&adurl=https://engineering.careers360.com/jee-main-college-predictor?utm_source%3Dgoogle-search%26utm_medium%3Dpaid%26utm_campaign%3Djeemain-clgpd&ved=2ahUKEwi5kbq_5_XhAhXf8HMBHRD6BBsQ0Qx6BAgQEAE

Hope u got my point. Ask if any query.

Good luck