How do I prepare for an upcoming tournament?

Apart from openings, tactics and endgames, what can I do to prepare?

The tournament is in a week

smoke some

thanks anything else

Only a week away? I'd say don't stress over it, get good sleep, know where and when the tournament will be, and don't be late!

eat some butter chicken beforehand it helps.

also have some good sleep the day before. u don't wanna go and sleep on the board.
have a water bottle by ur side during the game. I sometimes drink a whole 1.5L of it in a long classical day..

What everyone else said. Good sleep before. Don't eat too much before the games. And play What you know. No matter what happens, stay calm and confident and figure it out.