Hello there,
Your question is not clear. We cannot understand your doubt properly. Reading the question, it seems you have very low percentile in your JEE Main and you want a solution for that. In that case, you have three options:
Option 1- Get admission in private colleges through management quota.
Option 2- Drop an year and prepare for next year to get some good colleges.
Option 3- Leave B.Tech and study BSc.
It's upto you what you want to do. I'm helping you out with all the three options.

If you want to go with option 1, then you need to pay a huge amount of money to get admission in the private colleges since your JEE Main percentile is very low.
You can use our JEE Main college predictor to predict the best college for you:
https://engineering.careers360.com/jee-main-college-predictor?icn=QnA&ici=qna_answer

If you want to go with option 2, then you need to prepare well for JEE Main 2021. Know your syllabus, give regular mock tests. Here's a link which will help you in your preparation:
https://engineering.careers360.com/articles/how-prepare-for-jee-main

If you want to go with option 3, then you need to choose your preferred branch. Admission will be based on your 10+2 level performance. In some cases you might have to sit for an entrance exam.

Choose wisely what you want to do. Seek help from your parents. You can ask us if you have any doubt, we are always here to help you out.

Hope this information helps you.
Good luck!!

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