How better than to improve at potions than to spend some time in the potions lab? Whether that was brewing some progressively difficult potions or maybe watching other students brew stuff or even gaining knowledge by osmosis and just BEING there.

Because that totally worked.

Tobias could tell, somehow, before he'd even reached the door, that something was going to get in the way first. He reached for his pocket before the turnstiles even appeared, and was pulling out some coins by the time he stopped. Well, if these things were at the library then of course they'd be here too.

8 sickles? Tobias looked at the change in his hand. Only knuts and one galleon. Well, he would be coming back here more than once, so maybe if he put in a galleon that would cover the cost of a couple of visits. He'd have to remember to bring more money next time.

Tobias held the gold coin to the slot in the turnstile and watched as it changed shape accordingly. He dropped the galleon in and pushed through the turnstile to enter the potions lab, dropping the dozen or so knuts into his pocket as he did so.