Hello,

You are not be eligible as you might not have passed have 12th at that time. The eligibility criteria says the candidates must have passed 12th from any recognized university or institution.

In addition to that you have to upload the documents to the board so you have to have them before hand. For more details you can check the eligibilty criteria of UPSEE 2020:- https://engineering.careers360.com/articles/upsee-application-form

In that case you can register yourself for JEE main which is a National level entrance exam and you can give it even if you don't have your 12th credentials. JEE main is conducted twice a year. Registration for Januray month is completed you can't apply for it now. You can apply for the april month and can give it your maximum effort.

You will get top best college through jee mains if you clear it with a rank below 5k.

Hope it helps!