Boring

Haha.. Today woke up at 6am, then go toilet pee, then go back sleep until like 7, woke up then go sleep again, then woke up at 8, then go sleep again... Then woke up at 10.30, and finally started studying at like 11:30.. ZZZ Wasted my whole morning.. And I slacked by watching funny youtube videos until like 5pm... Up to now I only did half of maths OMG!!

And Chain Rule is important I just realised, it's the fundamentals of differentiation, even though is seems so easy u need to know the basis behind it or u can't really see it when the numbers become complicated. Thus I spent like 1 hour reading chain rule on the internet.

Blah... Doing intergration now, the stupid chapter which gave me headache last time...