I knew as soon as I read the thread what I would end up reading 🙄
Yes of course you put on your CV that you have been a SAHP, it's a very valid and valuable life choice not something to bypass.
I wouldn't list all your GCSEs just the amount of GCSE including maths and English. It's great that you have done a course to throw on there also, shows you are a self starter type and will forward yourself.
Most employers/recruiters know what is involved in being a SAHP. I personally wouldn't list all the day to day tasks of being a SAHP, most will assume you ran the house, children and all that goes with that.
I do think if you list the household jobs you did on there it will look like you are scrabbling around for things to put on there, which is not necessary as a SAHP is a valid role and choice it also looks like a filler rather than you being confident in what your previous experience, recent role, recent course and own personal qualities brings to the table.
Have confidence in yourself, your abilities, your choices and what you bring to the table. Go in knowing you are good enough.