Another bit of advice - get hold of the 'CAA Notes for the Guidance of Applicants Taking the CPL Skill Test' - Standards Document 3, Version 06.
This goes through the whole procedure of the CPL Skill Test and, most importantly, includes on the last page the CPL Skill Test tolerances.
My advice is, when you go flying, try and replicate a CPL skill test and try and do it within the tolerances given in the CAA document.
You will find it helps enormously when you come to do your CPL training.