*How do measure how effective your private tutor is?*

[Joeyhale]

My younger brother is getting ready for his GCSEs and we've hired a few private tutors. It seems to be like we are just spending money with no real way of knowing his problem areas or whether he's improving, the real answer will come in the summer at that may be too late. Is this an issue that others have had, if so how are you addressing it?

An experienced tutor should and will be able to pinpoint their tutee's problem. Being able to fix it and fixing it in time is another problem altogether.
If a tutor can't find your brother's problem then either they are not good enough or not brave enough to say it :)