Kelas Cemerlang & Kelas Galus a.k.a Kelas Tambahan!!!

I got picked for 4 classes of Kelas Cemerlang and 1 Kelas Galus, a.k.a. extra class! Before this, this Kelas Cemerlang and Kelas Galus was held during school hours. Why do they need to change it to after school hours? And before this, I wasn't picked to attend any of such classes. This means staying back in school for 4 days until 3:15 p.m. or 4:30 p.m.! And I so do not want to stay back! It's so hot in the afternoon these days!!! How do you expect me to bear through this heat? It's just so hot! I can't even concentrate well at 12 noon, what more at 2 p.m.

My Kelas Cemerlang timetable:
Monday
2:15 p.m. - 3:15 p.m. Bahasa Malaysia
Tuesday
2:30 p.m. - 3:30 p.m. Biology
Wednesday
3:15 p.m. - 4:15 p.m. Additional Mathematics
Thursday
3:15 p.m. - 4:15 p.m. Chemistry

What am I supposed to do during Wednesday afternoon from 2 p.m. - 3:15 p.m.? I've got to waste an hour in school just to attend my Additional Mathematics Kelas Cemerlang.

My Kelas Galus timetable:
Thursday
2:15 p.m. - 3: 15 p.m. Bahasa Cina

This is one subject I'd need loads of help with.