When you get to the end of year 9 in your GCSE's, and you have to make choices concerning what subjects you will be studying for the next two years!
You probably know by now (through your studies of chemistry) that electrons are the “magic” behind chemical reactions. They do all the hard work - moving here, moving there, joining this atom, leaving that atom, forming bonds, etc.
Mathematics is built on laws. No matter what your opinion on if the laws are stupid or not, you’re going to have to do what they tell you if you want to pass your GCSE.
We all know that exam-time is stressful. There’s all that information to retain, and some of us are just no good at that, right?