TOEIC585点なのであれば、基礎が固まり切ってない段階だと思うので、 やるべきことはDistinctionでの上級語彙強化ではなく、より基本的な語彙と英文法の基礎固めだと思いました。 You are jumping the gun. You have to learn to walk before you can run!
I totally agree with his thought because I’ve felt like same things by doing it as I take a English class on online. besides it, I’m sure that the progress that memorize the new word or phrase before taking it makes your motivation,effective and confident towards study accelerate overwhelmingly.