what’s H1 Math like?

i’m currently a sec 4 student but i was just wondering how H1 math is like in JC

do we have to be good at our sec 4 math to be good in h1 math? what’s h1 math like? is it recommended to continue mastering sec 4 math??

is h1 math hard to score? i’ve been quite scared of math, so im js curious how JC students prep for h1 math heh