What should I do? Advice please!

I have a high jump competition in a few days, and really really worried!!! I do great in practices I've jumped 1.35, but in competitions I do worse. because I get lack of confidence, and nervousness. I have been talking to friends, and they say I'll do great... but we had a practice today and I didn't make it over 1.25!!! and I'm not sure what I'm doing wrong, and like I said the zone is coming up in a few days... what can I do?? techniques, advice please anything I'm kinda freaking out here!!

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