I would put your main details at the top, eg name, address, contact details (phone, mobile and email), age if you want, etc.
Then I would put a short paragraph detailing your main skills and attributes, eg:
"Aimsmum has spent many years working in the [insert here] industry and is well-qualified in this field. She is enthusiastic, organised and enjoys working as part of a team."
Follow with your qualifications, starting with your highest one. For O and A levels, you could put "10 O levels including English (A) and Maths (B)" for example, that would be sufficient.
Then list your jobs, starting with the most recent. I do this in table form, with columns for company name/address, position, dates worked, main duties and reason for leaving.
Does that help?