Hi Sarvagya,

Yes,you can fill the form if you have completed your 12th in 2017 and with additional subject in 2018 as the age limit is,the candidates age should be between 16 year to 22 year for General and OBC candidates and for ST/SC age limit can be extended for upto 5 more years.

Hope this will help,please feel free to ask if you have any further queries.

Thank You.