This swimming minigame is just the worst. Currently had to repeat this bore for 9 days and I'm still not done
you need to hold down the left arrow and NOT let go of it. using autoclicker slows you down. keep on held down.
also, at the end of each session you will be told "swimming level +0" or "swimming level +1"
the former means you failed the minigame and got nothing. you can do it a million days and never finish.
the +1 means you actually succeeded in the "minigame". which really, is just hold down the left arrow
I don't know why it is even a minigame at all.