N1

にかこつけて

In the name of, Using the excuse of, To use as a pretext of, Under the guise or pretense of

試験しけん

に

かこつけ

て

な

"(You’re) making excuses by pretending it’s because of the exam."

のために

Used to express purpose or "for the sake of"

という理由で

For (that) reason; on the grounds of (that), With the reasoning, Under the pretext of, Due to

ものですから

Because, My excuse is, My explanation is

〜んです

Used to provide explanation or emphasis in a sentence.