I think I've returned everything I studied in secondary school back to the teachers. When my brother asked me to check whether he got the corrrect answer for the qn on solving equation using completing the square, I forgot how to do lers. But anyway, i do not nid to know how to do these anymore, unless i wanna go give tuition.

I've finished watching God of Study. =D It's a drama I recommend everyone to watch bahs. Very nice! Now I'm into this entertainment show 百万小学堂...