Help For TMT

Hello, Tomorrow I will be playing a big tournament with so many rated players , so please give me some openings suggestions or any other suggestions that u think will help me to win rated players.
Thanks
PLZ REPLY FAST!!!!!!!!!

Chess is not only about the opening. Play the opening you are most familiar with and know the best.
Tactics are more important in many games as one tactical blunder can kill you.

Yes Chess is not only about openings that's why I am asking for other suggestions also @Nihongo-san
Thx