I’m starting self teaching myself soon and would want to know if anyone can give some info about the course...
Is this additional IGCSE or A-levle? For A-level it is more difficult than IGCSEs. With additional Maths you'll have to learn more modules than the normal Maths, so it will be more challenging and time consuming in the sense that you'll do more difficult topics (and more difficult modules if you're doing A-level). It's mainly for people who enjoy Maths and will pursue further study in a related area.