Tests are intended to spot strengths and weaknesses, but each person develops abilities differently over time.
Subject tests have test scores (quantitative measure). In school this is usually supplemented with teachers observations (qualitative measure). They indicate areas of strength and weakness.
Ability tests give an average score, usually based on three areas: non-verbal (abstract sets of geometrical and numerical symbols to test logic and reason); verbal (comprehension, relationship between items, vocabulary); quantitative (numerical ability).
National tests do not just test children's abilities - they are intended to provide a form of measurement for government targets.
Rather than focus on learning to the test, encourage creative thinking: choose a cuddly toy or household item or a simple object (e.g. housebrick) and come up with as many ideas as you can about what you can do with it.
Have to take a test? Remove fear of the unknown by finding out what the test involves - do some practice runs if possible. Understand the marking system - which parts get the largest amount of marks. prioritize those areas that need more work and/or sections which carry most marks.
Main source: Make Your Child Brilliant by Bernadette Tynon. Quadrille, 2008 (ISBN 978-184400-579-6)