Should I get a job to build my CV

A lot of my friends have jobs and I know the best way to improv skills and extend my cv is to get real life work experience, but I still haven't done my GCSEs and don't want the stress to get in the way, should I get a job as soon as I turn 16 or wait until I start my A-levels? Any and all advice would be great!
(Also which jobs would be best/you would recommend!)

Many juggle both grades and work experience/volunteering just fine. Get a small job you can keep up over the weekends and holidays, it will give you real-life experience and also some money on the side.
Also consider volunteering in a place related to what you intend on applying to at uni/for a job as it shows that you are willing to give your time to do something you are interested in without getting paid.
Best of luck!

I already Volunteer with my local scout group of Fridays and usually get home around half five every day, I am doing two coursework heavy subjects which I do during the weekends, I've been thinking of an evening job, do you have any recommendations?

You are fine building skills with the Scouts. Think about a weekend job or a second volunteering experience, or work experience during your A levels.

Tbh I'm more interested in earning cash as my family is just above poor so it'd be ice having some financial freedom

I already Volunteer with my local scout group of Fridays and usually get home around half five every day, I am doing two coursework heavy subjects which I do during the weekends, I've been thinking of an evening job, do you have any recommendations?

A local retail store or a pub, somewhere not too serious that won't ask you for major commitments, also somewhere that is used to dealing with young people in their jobs so they know what to expect and don't ask too much of you. Don't overwork yourself as well, maybe save it for a summer/holiday job if it is too much.
Best of luck!

A lot of my friends have jobs and I know the best way to improv skills and extend my cv is to get real life work experience, but I still haven't done my GCSEs and don't want the stress to get in the way, should I get a job as soon as I turn 16 or wait until I start my A-levels? Any and all advice would be great!
(Also which jobs would be best/you would recommend!)

Weekend jobs e.g. waitressing/working in kitchen as KP (Kitchen Porter) you could do! I would recommend getting a job early on as it of course gets you some cash and you learn a lot of practical skills that are useful. It might also be worth thinking about what kind of career you want to do and if there are any young people's groups associated with it e.g. if you were creative you might join a gallery/museum's youth forum, if you are thinking of doing something more science-related look into institutions young people's programmes + see how you can get involved. Also worth thinking about improving your skills for more 'high-skilled' jobs e.g. if you are interested in going into computer science at uni/for a future job then try doing a free course or setting yourself a personal challenge - although you won't get money with something like this, building up your skills at your age will set you apart when you get older!