Hello Shrutika!

SEBC category comes under the OBC-NCL category. SEBC stands for Socially and Economically Backward Classes and comprises of families that have annual income less than 6 lakhs. If you have valid documents of OBC NC and SEBC then you should apply under OBC-NCL category. SEBC certificate is not valid(or not necessary) for counseling in All India quota and other examinations, it is only valid in state . Keep in mind, to get a OBC-NCL certificate to exercise reservation. SEBC and OBC-NCL are still different categories as some castes of SEBC are not mentioned in OBC central list. You can check the central list of castes under OBC and apply for a central OBC certificate if you find your caste in the list (copy and paste link in your browser):-

http://www.ncbc.nic.in/user_panel/centralliststateview.aspx

For Maharashtra:-

https://www.google.com/url?sa=t&source=web&rct=j&url=http://www.bcmbcmw.tn.gov.in/obc/faq/maharashtra.pdf&ved=2ahUKEwjQ0-nUjf PsAhUFxTgGHWxtCxwQFjAKegQIHRAB&usg=AOvVaw2ak2hNae1HOZg3lo28GN72

You do not need to apply under EWS category as it is a sub category under General category and comprises of economically weaker families.

Hope you are clear now!