What they did after they finished their tests:

Ash: Fell asleep.

Misty: Communicated with May through her calculator.

Gary: Counted how many curse words he could mouth to Drew without getting caught by the teacher.

Leaf: Replaced the batteries in her calculator 37 times.

Drew: Counted how many curse words he could mouth to Gary without getting caught by the teacher.

May: Communicated with Misty through her calculator.

Paul: Drew a very detailed picture of the teacher riding an unicorn.

Dawn: Braided her hair like 20 times.

Barry: Colored all of his 7 pencils black with a sharpie, and then proceeded to color the bottom of his white shoes pitch black.

Meadow: Repeatedly tried to shoot her hair ties at the teacher (only hit him once, he didn't notice it).

Cilan: Wrote down the alphabet, then proceeded to learn it backwards.

Iris: Was trying to blow the biggest bubble with her gum and ended up having to go to the bathroom because it went up her nose.

Clemont: Counted to 100 on his calculator, and started over again.

Serena: Literally brought nail polish and painted her nails a lovely shade of purple.

Gladion: Unlocked the ability to wiggle his left ear.

Moon: Drew on her arms with a sharpie (didn't come of for 2 weeks).