There are ten skills tests that each test an area of racket skills that, between them, give quite good coverage of the skills needed in normal match play.
Based on the testing data from hundreds of players of varying level, we have been able to correlate between a player's level and the score they should expect to get for each test - and also from the test score they get back to their likely level.
We have been able to scale and map each test score such that we can combine them and work back to a derived, technical level and that it what we show on the testing page once you have completed all ten skills tests.
It's likely that your derived level is not the same as your actual level but it's also likely that it's not too far off. The differences are likely to be related to your strength and fitness and also your mental approach to the game but having a derived technical level is an interesting measure in itself.
For all of your tests, you will have an expected score based on your level. A good starting point is to identify those tests where your actual score is lower than your expected score as those are likely to be good areas for you to work on. If you have better skills, you'll have better results!