Q: Does a CV always need to be only one page?
A: CV length should not exceed two sides of A4 paper. How much of those two sides you fill depends on how much you have done. Undergraduates and school leavers may be hard pushed to fill two sides of A4 simply because they may not have very much experience, if this is the case one side of A4 will suffice. Conversely candidates who have established a career history will have to be selective as to what they include so that it all fits on, in this case make sensible use of margin and paragraph sizes.
Q: Should the education section always be near the top?A: If you still are in or have recently completed formal education your academic achievements will form a major part of your qualifications, and it is recommended to place these near the top of your CV. Also some industries, notably communications, value related experience above degree work and therefore, place your academic qualifications further down the page.