I'm improvement exam student and I filled Jee Mains 2020, in that form I filled 12th appearing. is that okay?

Hello,
As you have already appeared for your class 12 and appearing for improvement exam. So you should have entered 12th passed in the application form. You will face some problems in the future. You can appear for JEE Mains in there consecutive years, the first year being the year you appeared for your class 12. So if you have appeared for class 12 in 2019, and appearing for improvement exam in 2020, you can only appear for JEE Mains in the years 2029 nd 2021.
Improvement for all subjects- If an aspirant appears for improvement in all subjects in 2020, then the better of both the years will be considered.

Improvement in one or more subject- If the candidate appears for improvement in 2020, then the top 20 percentile of 2019 will be taken into account. The maximum marks secured in the necessary subjects will be considered to calculate the aggregate percentage in such a case.



For more details on JEE Mains eligibility criteria please visit this link https://www.google.com/amp/s/engineering.careers360.com/articles/jee-main-eligibility-criteria
Hope it helps