>>281580757
The real answer is that whatever prep Izuku could've done doesnt matter.
Remember that impressive performance he showed removing all that trash on the beach before he got OFA? That superhuman feat of moving that vehicle to the top of the pile?

Well Izuku then lost in physical strength to everyone in Class A in all of the tests Aizawa had them run at the start.
Izuku was weaker than invis girl who is a small chubby japanese teenage girl. He was weaker than Jirou in every test. He was weaker than Mineta in every test.

Hori just won't let Izuku win, ever. No matter what.