한국어능력시험 쓰기 팁?

Hi, I'm Gulnora from Uzbekistan, just moved to 동국대학교 this semester. I want to take TOPIK 4 next time, but always get low point on 쓰기 part. My 듣기 and 읽기 is ok, but 쓰기 is hard for me. Anyone who also study 한국어능력시험, can share how you prepare for 쓰기? Maybe good books or study group in 서울?