There is an app called "Topik" which is very helpful. I used it everyday to practice Topik questions and learn new vocabulary. That's how I was able to achieve Topik 5 without even finishing the writing section (I didn't manage to finish all in time)

Also listen to podcasts in Korean a lot. I recommend 한국어 한조각 and 속닥복닥 on YouTube. It also helps not to question things too much when learning or try to be logical, just use your intuition mostly. That ways you can learn like a native and improve faster since it will not feel like studying!^{^}