Hello Aspirant,
Due to unavoidable circumstances of this global pandemic all exams have been delayed from their usual dates so at this point of time there is no any official notification issued for the exams which you have mentioned in the question so it is quite difficult to guide you with an accurate dates. For e.g if we take WBJEE 2021 then the WBJEE 2021 application was expected to be out in the month of December 2020 but it is not released yet and is expected to be released by the end of this month. It will be released on the official website as given below by WBJEEB :-
https://wbjeeb.nic.in/wbjeecms/public/home.aspx
After the release of application form you can follow the complete application process as described below :-
Image
Format
Size
Dimensions
Photograph
JPG/JPEG
3 kb to 100 kb
4 cm x 3 cm
Signature
3 kb to 30 kb
4 cm x 1.5 cm
For complete details and live updates about WBJEE 2021 Application form kindly visit the link given below :-
https://engineering.careers360.com/articles/wbjee-application-form
Similarly for Live updates of other entrance exams like BITSAT, MHT CET,COMEDK kindly check out the links given below :-
https://engineering.careers360.com/articles/bitsat-application-form
https://university.careers360.com/exams/mah-aac-cet
https://engineering.careers360.com/articles/comedk-uget-application-form
I hope this information helps you.
Good Luck!!
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