There are conditional branches for every thing but levels, as far as I have seen, how do you guys check for a specific level?

set variable = actor's level, then use that variable in a conditional.

That really vague, what variable? where is it? controll? nothing to do with actors level in control variable
how do I set it so its a conditional?

This is basic eventing Adrien, try studying what each event command does before you try making a game of any sort.
This is basically what leongon was talking about:

you are jesus