The websites for Sutton and BV often contradict themselves. Even when you phone the schools, you sometimes get conflicting information. I can tell you what the exams have been for the last 5 years.
1. Maths. Standard. Very similar to NFER pack, only possibly easier as my pupils tend to score 5 more marks on average during the actual test and finish with significant time to spare. They are allowed 50 minutes for 50 questions. Do Bond maths assessment books first. Then any other practice you can locate which is in the 50 question NFER format, before you finally use the NFER maths papers, standard. Bond test papers are harder but I sometimes use them before culminating in NFER.
2. Verbal Reasoning. Standard. 10 minutes practice. 30 minutes to do 45 questions. No idea whether it is 15 or 21 types. I do IPS practice book, IPS papers, AFN papers and finally NFER papers. I also make sure to practise anagrams separately as they always come up. If I have to do more than this because child needs practice I shall use CGP possibly or Walsh (although they are at the hard end). I do not use Bond, either books or papers, as there are too many irrelevant questions in these.
3. Non-verbal. 2 of the 6 types usually appear (codes, matrices, series, odd one out, most similar, analogies). You are allowed 12 minutes for each section of 20 questions. Total mark 40. I'd practise Bond assessment papers, Learning Together, AFN, Bond papers and finally NFER papers. Should your child be still struggling, post-AFN (less than 50 out of 60), you might consider slotting in others. Bond papers are generally harder than NFER, apart from TEST A of the pack, but are still good practice.
The exam is very predictable so you have to score quiet well to pass this exam. Not necessary 90% in everything but a good enough combination. E.G. 40/50 in maths, 35/45 in VR and 34/40 in non-verbal would give you last score to get in.
Hope this helps.