If you are that worried about passing, maybe this isn't the gig for you! 122 Is
Serious business. I just upgraded (finally). My FIRST DAY as a captain, second leg off IOE, I got compressor stalls on #2 and had to shut her down and return single engine.

If you aren't prepared for that, or think that you will have trouble with that, please, for the sake of everyone, go get more time as a CFI, or fly something else for a while to get done more experience.