回答
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In addition to club activities, I'm also committed to my studies, taking afterschool supplementary lessons and going to private tutoring.
「部活動以外でも放課後に補習や個別指導で勉強に打ち込む」というのは、このようにいいます。
In addition to club activities, I'm also committed to my studies, taking afterschool supplementary lessons and going to private tutoring.
in addition to = 「〜に加えて」(「〜以外でも」の言い換え)
club activities = 部活動
be committed to〜 = 〜に打ち込む
supplementary lesson = 補習
private tutoring = 個人指導