Hi

If you drop in your 11th and again study 11th then there will be no loss of attempts for your JEE mains and JEE advanced examination.

This is because,

One can give JEE Mains entrance examination for a maximum of 3 consecutive years starting from the year of appearing for 12th board examination

One can give JEE Advanced entrance examination for a maximum of 2 consecutive years starting from the year of appearing for 12th board examination.


So, it doesn't matter even if you repeat your class 11th, what matters is the year in which you appear for your 12th board examination


For example,

If you pass your class 10th in 2019 and study 11th in 2020 and again study 11th in 2021 and then appear for your class 12th board examination in 2022 then you will be eligible for JEE main 2022, JEE main 2023 and JEE Main 2024 and as JEE mains is now conducted 4 times a year that means you will have a total of 4 x 3 = 12 attempts for jee main. And for jee advanced examination you will be eligible for jee advanced 2022 and jee advanced 2023 , that means you will have two attempts.


Thank you