Hi Aspirant

First of all do not be disheartened at all by your low percentile in your JEE mains. It completely depends on you what do you really want to do in future. If you want to pursue engineering and you are thinking about taking a drop then consider all the factors and conditions around you like your family's financial condition, your age, whether you would be able to focus and devote your entire time for studies and preparation for JEE examination consistently or not because 29 percentile is way too low.

There are still options for your if you do not want to drop, you can apply for many other engineering colleges that consider your admission based on the marks you receive in your class 12 board examinations or you can apply for many other good colleges that conduct their own entrance examinations as their entrances are easy compared to JEE.

If you still feel that you can not go with science or JEE then it would be better that you look for another available career options as just getting an IIT or engineering is not the sole purpose of life their are other more exciting and rewarding career options too .

Please do consider your situation and your future aspirations and take your decision accordingly but do not get disheartened, take help of your friends and family members to take better decision and understand your strengths and weaknesses.

I hope this answer resolved your query.