Stick all "other interests" at the end of the CV, do the same with any non academic qualifications.
Start with a paragraph or two of "personal summary" written in the third person.
Then put the most basic details – name, DoB, address, contact number and email address.
List GCSEs as "11 (or however many) GCSEs grade A-C including English and Maths" – don't list them all and leave out any cr4p grades like passes.
Do NOT put interests like "going to the cinema" or "socialising at the pub" – only stuff that is a bit different/impressive.
The whole purpose of a CV is not to rattle off a dull list of facts – it needs to persuade potential employers that you can either make or save them money (depending on the job) – list ANY examples of how you've done this and you'll be fine.