• 점수←點數 (point number)
• 통과←通過 (connect across)

통과하다 has two similar senses:

• to pass through an area or physical obstruction such as a gate
• to pass scrutiny of some sort such as an examination, interview, or security checkpoint

Think of any physical or abstract obstruction/challenge to be passed.

The similar 합격하다 (合格하다) only works for the latter meaning (passing scrutiny, such as a written test, interview, selection process, or audition).

What's wrong with "Although my score is not good, I passed?"

It is not clear who's score was not good, and who passed. I'm a native korean, but I thought this sentence meant "Your score was not good, but you passed"

Shouldn't this be 합격 (合格)하다?