I used this for a school revision group. The texts were (as advertised) harder than the actual ones and too hard and long for the group I had. There were some errors in the answers and the answer booklets were missing boxes and grids which caused confusion and I think was a poor oversight. I was also disappointed with the length of time I waited for these to arrive. Ordered Friday and received on Wednesday which meant I had to create some additional resources for the interim and defeated the object of having paid for them as it was to spare me the bother I won't pay for these resources again. I have since found