Actually I'm not yet a passer of the ESP-TOPIK exam, but have the goal to pass it..

By the way my teacher and my colleague often advice me that may also help you.. Watch Kdrama to gain more vocabulary, watch ESP-TOPIC review from internet for more understanding about the Exam, and Especially read often on korean words with English translation then try identity things in our surroundings using korean words and go further bet by bet. After that integrate the words in to sentence.. That is when you can see the result.

By the way don't overdo things, do it nice and steady.. Don't overdo it because it may cause unstable mind. Take it step by step or little by little. Afterward, things would be full filing for you..🥰

Wish it helps🥰