Or if you want to see the description of the criteria for assessment on the test, download "Document 19, Version 04" Notes for the Guidance of Applicants taking the PPL Skills Test (Aeroplanes) from the CAA....
As an example of how this could be helpful, (though I like the idea of "don't kill my kids! I drove my driving test for the road imagining my grandma in the back seat!) I've flown my whole 45 hours training with the CPL acceptable cruise altitude tolerance of 50' (c.f. 200' for PPL) in mind as a target.
It can't hurt to clearly understand what you are training for for the purpose of getting your license... as long as you understand that you can only really learn to fly on your own once you have it.