Felt you needed a response
There are various work books with VR type questions aimed at younger children to get started. Dont go straight in to those at the top level or you will scare both of you!
I would treat them as puzzles to start with.
The English paper for CSSE is comprehension so vocabulary is more important than spelling (although correct spelling is needed for some VR questions) All 3 of my children have real issues with spelling but all got places at Colchester GS so its not critical.
Having said that if its simply a case that no one has taught your child how to spell, rather than it being something that they struggle with then I would definately do some work at home.
There are several CD rom spelling 'games' if you want to make it more fun.
I would also start reading together - traditional classics - to get used to the language that tends to come up in the English test.
And encourage wide reading to generally increase vocabulary.
Probably bit soon to look at the CSSE maths papers - would think if your child is comfortable level 3 & going to tutor next year then you just need to makesurethey are making steady progess this year.
Have you looked at CSSE web site? You can order past papers to give you an idea of what is expected.
Hope this helps. At the very least it might attract more responses for you - especially from those who disagree with my advise