Hi my name is Ajanth and I am doing AQA for all sciences so this may not help those doing different boards.
I've done physics and biology isa paper 1 and 2. Pretty easy. Just need to do a graph and table which basically everyone gets full marks. You will be given time in class to fill a research sheet based on the context given to you by the school. Physics is about friction and how different surfaces can affect speed. Biology is about rate of respiration. For both of these you need to plan an experiment and know what you would do. You won't actually do your experiment but instead everyone does the same experiment in class. Based on these results you will need to fill your table and draw a graph. Just look up mark schemes, past papers( a lot of questions are repeated every two years so I was prepared) also revise key terminology(just search e.g. physics terms. Definitions) hope this helps you. I am yet to do chemistry but I know that it involves rate of reaction.