“I would like some advice on how to complete your comprehension papers with my child. He has three months until his exam, and I would like to know how to spread the papers out in order that he can complete them in time and make the best use out of them, as ideally I want him to have completed both packs.” Sameena
The first thing I would say is that it is important to work carefully, rather than rushing to complete everything. It is more important that your son learns from his mistakes and successes than that he completes every paper: rushed work tends to involve reinforcing errors rather than correcting them.
I would start with papers 1 and 2 of Volume 1. If these are fairly successful, I would move on through the pack. If, on the other hand, your son finds them difficult, you can use papers 1 and 2 from Volume 2, which are similar.
Work through Volume 1 like this, then complete any papers from Volume 2 which have not yet been used.
It is very useful for a child to repeat answers or whole papers which they found difficult, consulting the mark scheme as they make their second attempt. Skills and knowledge really sink in when they are repeated.
My materials are designed for careful, slow work, rather than speedy exam practice (of course you can use them in timed conditions, but this doesn't make the most of the detailed feedback provided). About a month from the exams, if the basic skills are in place, it is worthwhile to start practising timed papers. I don't know which schools you are applying to, but they will probably publish their own past papers. If not, schools such as Manchester Grammar, St Paul's Girls, Francis Holland and Habs' Boys have lots of papers online.
Also, don't neglect your son's creative writing. As a guide, around 1.5 pages of A4 lined paper is a suitable length for an exam-style story. He should focus on being descriptive and interesting, rather than recounting tales of goals or explosions! The most useful pieces of advice I can give for creative writing (it is impossible to do justice to this in a brief email) are to use as many of the senses as possible (touch, taste, etc.), avoiding the most obvious one in a given situation; and to pay special attention to punctuation, above all else the placement of commas and full stops.
As a final comment, in my experience too much preparation can make a child so bored of the whole process that they don't really want to succeed any more. Therefore it's important to strike a balance between encouraging your son to work, and letting him play and enjoy his life.