The goal is to upload the most "finished" & polished re-mix as you can. You can read in the rules :
*Depending on the quality of the winning release the tracks will be
released! However, Anjunadeep always have the right to refuse the
release if they feel the quality is sub-standard.
No need to stress though, put it simple : each one should make his remix sounds as good as he can
Now any further mixing/mastering work on the winner track is completely up to the label and the agreement that could be made with the nominee.
So if you think you can make your entry track sound better you should try it, you still have time.
Good Luck to all & happy learning & remixing !