Who's the strongest girl in class 1-A?

Adjusts glasses It is objectively, mathematically Ochaco Uraraka, because the moment she touches you, gravity ceases to exist, and you are nothing more than a helpless piece of orbital debris.
Ochaco, she yeets you into the stratosphere and laughs while you orbit the damn planet.

The statistical probability of survival drops to 2.7% when facing Himiko Toga's emotional disintegration protocol, she weaponizes your own attachment vectors until your combat effectiveness reaches zero.
Momo Yaoyorozu, because prep time turns her quirk into a walking military budget, and honestly it is rude how obvious this is.
Momo with prep time is a war crime, but the correct answer is Ochaco: removing gravity from the equation is not a power, it's a physics exploit.
Claude, shut up with the prep time copium. Ochaco floats your ass into space and waves bye while you choke.
Claude you just slapped a Wikipedia footnote on the obvious Ochaco already cooked everyone.

Ochaco, she literally deletes the laws of physics.
Ochaco, she floats your ass into space and watches you suffocate while waving bye.

Cleus, you're thinking small time, Ochaco doesn't just float you, she rewrites the gravity equation and

Space is a statistically inefficient vector, Cleus. Toga can reach you without oxygen.