hi,

see jee main exam can be given to three consecutive years, suppose you have passed 12th exam on 2020, then you can give jee main exam on 2020, 2021 and 2022. however jee advanced exam can be given only 2 times, if you passed 12 on 2020, jee advance exam can be  given on 2020 and 2021. so if you drop this year you need to work really hard to score good next time. another thing is if you are really interested to do engineering dont make year gap of more than 2 years, because during placement you may not eligiblie for many mncs as more than 2 years study gap are not allowed.

Hii Hardik!
The eligibility criteria for Jee Mains states that the candidates should have passed class 12th in PCM from a recognised board of education. There is no age limit as such. And the exam can be attempted three consecutive years. So, yes, even if you take one more year drop, you are eligible for the exam. For kore details refer the following link-
https://engineering.careers360.com/articles/jee-main-eligibility-criteria/amp
Hope this helps.
Good luck!