/execute as @a unless score @s level matches 1.. run scoreboard players set @s level 0
For question #2, you will need 1 impulse command block and 1 chain command block. Paste this in the impulse command block:
scoreboard players set @p level 2
attach a chain command block to the impulse one, paste this in:
tp @p <x> <y> <z>
and set it to always active.