124 pages, A4 size, 27 line drawings, four appendices....

These are the features of the book, and by and large I don't believe anyone buys books on this basis.  They buy the books on the basis of what result they think the book will give them.

And yet huge numbers of books tell me about the binding, the physical details - and it is all a total waste of time.

And let us not forget the long piece about the author.   Why tell me about the author?   If you are publishing a guide to grammar for GCSE English students does it matter who it was written by?   I probably won't have heard of the person, I take it that he or she knows all about grammar, and I expect they have taught in a school for quite a while.  So telling me all this stuff does nothing at all for me.  I have already taken it as read.

Do an experiment.  Send half the schools you want to mail details of your books with all the usual features.  And then send the other half details with no features.  Then see what happens.