If you have high MMR in normal games, pre-level 30 feels like Challenger queue.

Minus the Challenger mechanics.

I'm currently sitting on 39W 5L on my smurf who is level 16 atm, and due to the high MMR I get to play vs and with the same people almost every game, I get to play with people higher level than me and I wait more than 10 minutes to get into a champ select.

I'm not complaining. I'm just sharing my feelings for what it feels like. My recommendation is not to tryhard and win every game until you reach the point where it gets to the same scenario as me. Unless you wanna be feel and breathe Challenger versus pre-level 30 players.