YOU SAID:

i don't know why but I am good at tests.

INTO JAPANESE

私はなぜ知らないが、私はテストが得意です。

BACK INTO ENGLISH

I don't know why, but I'm good at testing.

INTO JAPANESE

理由は分かりませんが、私はテストが得意です。

BACK INTO ENGLISH

I don't know why, but I'm good at testing.