あなたが過去のひとつを変えられるなら何変える？って質問文で
If I could change one things,I would like to...に続くのを考えるやつで

I would like to study hard.

Because I have got only pass now.

The pass is NIHON university which we call nikkoma.

nikkoma is the highest discrimination terms in Japanese university.

I wanted to get waseda university's pass.
Despite I could get.....

So If I couldchanges one things about my past, I would like to sikosiko!!!

fuckin'nikkoma！！！YEAH！！

これなんだけど、、、