If you know who your opponents will be, you can check their old games, see not only what openings they like to use, but also what style they have.
If you want to prepare yourself, do some tactics and make up your mind what openings you want to play
Preperation
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Hi people on 2 november i will play on 15 + 5 tournament i study chess all the time.But how dose one prepeare for a tornament