You should say:
An activity that I like to do in my school after finishing school is playing badminton which I started to do since I was in 6th grade.
It is actually a badminton class, so we have teachers and other students too. We practice badminton here for an hour. Sometimes, we even stay there for another half an hour. Just like tennis, you can play badminton as a singles match or doubles match. The rules are pretty much the same as tennis. The only difference is that the badminton shuttlecock is lighter than the tennis ball, thus, it requires less strength.
Due to my short-sightedness, I am not very good at playing this game but I enjoy it anyway. Firstly, it helps keep me fit. In addition, I can train my eyes to look further and faster, and it quickens my reflexes. Last but not least, it helps me a lot in improving my teamwork skills.
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IELTS Band 8 Sample Topics