C2. Main things
Structure and bonding
They will always ask you about diamond, its properties and how its bonded. You HAVE to revise it becasue if you don't you will lose a lot of marks. Off the top of my head I can tell you that there are big 4-mark questions in there so not revising for this topic can be the difference between an A and an A*
As much as everyone hates these, they will always come up as well. When you do them often, you realise how simple they actually are. You don't have to be good at maths, it's just about logic. If you don't know the answer, just write a lot of scribbles or random things...You never know, you might get a mark
B2. Main things
Although there is not too much to it, you need to know its intricacies. You need to know key terms l;ike fossil fuels and O-Zone layer.
OMG! These are easy. Only if you revise though. No work and you expect the reward? That isn't how it works my friend. You need to know the loction of where enzymes are produced, their names, what they digest.
The examiners love this so if you don't revisie for it, expect a bad grade. It only requires you to look at a chart and see when an animal dies, where does it go. Continuing from the animal theme, You also need to know how animals lose energy
P2. Main things
Nearly there, OK
LEARN YOUR COMPONENTS. until you see them in you sleep. No joke. you are bound to get a question on what the name of a component is. Also learn what components stay in parallel or in series.
I hate these but what can you do. The best thing to do is learn the key terms and how to identify them with your oscilloscope diagram. Like amplitude or frequency.
This ones quite easy, provided you know hat a plug is. If you do, it is a doddle. make sure you know the ratings of UK electricity (230V at 50 Hz)
Good luck with your exams guys. See you on the other side. :)