Hobbies and interests are only of any real value if the CV does not contain a work history (school / college leavers).
After you have a few years work experience, your personal interests are uninteresting (unless they are very exceptional) and just take up space, academic qualifications other than the last, highest level of qualification are also less relevant.
Prospective employers want to see what you can do on the job, what you've been successful at. If your last success after a few years job experience was a school/ college exam or a hobby, then you are not going far.
There are no hard and fast rules, only guidelines. Your CV is advertising you, not some standardized nonentity. Above all, your CV needs to be targetted!
Your CV has to be easy to read, as the reader may have several hundred CVs to read.
A good CV contains:
* Name, age, nationality, contact details (phone and email are enough).
* Overview of knowledge, skills and experience relevant to the job. It is important that this is on the first page.
* Reverse timeline of jobs with descriptions, to show where you got the knowledge and experience. You generally only need short descriptions of old jobs, although you may want to accentuate the one or other if you have changed fields and want to change back.
* Qualifications (highest qualification at start of career, plus any additional qualifications gained during you working life) , any job related citations (Awards, patents, etc).
Whether you do the qualifications, or the job timeline first will depend on your job experience. Keep it as short and to the point as possible, use plain language and avoid "white-paper" language.
Make shure their are know spelling or gammatitical erors. Get somebody else to proof read it for you.
Limit yourself to a maximum of 2 different fonts, and use a serif-font (like times) for the body text. A serifless font (like Arial or Helvetica) can be used for titles, and bold for the employer's details.
Use white space to lead the reader's eye. Avoid scrunching the text together, write less, or use an additional sheet (keep it to 2 if you can, but never more than 4).
Look
here to see what typically happens to your CV. It is easier to understand how to aim it, if you know how it will be treated.