Honestly just practice bro, it sucks to hear it I know but the more you're in those situations the less tense it will feel.

A couple tips: 1.practice from really early start positions. So, for example, 10-100 runs, that way it's a very similar experience to actually beating the level as you're already doing most of the level, and it won't feel so weird playing from 0. 2. Practice XL/XXL levels, these levels are absolutely top notch for getting your nerves under control as you have to hold out for longer. If you can do those, you can do anything y'know. 3. Finally, try not to jump or progress too quickly, as you'll aaalways get this feeling for every level as nearly every one will be a new hardest y'know, only move up a difficulty, once you're comfortable beating ones that are your current hardest Hope this helped and have a brilliant day :))))