If you're also good at maths and planning on doing maths a-level then they are good choices. If you aren't doing maths wouldn't recommend physics (bit of a dead end without maths plus makes it harder) but chem will be fine since the maths required to understand the content at a-level standard, is very simple. They are fairly similar to gcse though slightly more focused on actually understanding concepts than just applying random facts though there is still plenty of pointless rote memorisation.
Basically if you're passionate about physical science and want to do something scientific later at uni such as maths, physics, chemistry, engineering or compsci then maths, physics, chem (+ fm if you're allowed 4 and are v capable with maths) is the perfect combo to prepare you and keep doors open.