Agreed..I think the levels 3 and 4 are vastly different in terms of their difficulty
I think the author enjoyed the challenge of writing Level 4 very much ...
They are definitely above the level of the Bucks 11+ and GL Assessment tests around the country.
The vocabulary on the Level 3 papers is pretty challenging, so I think they are well worth using for that reason, particularly during the holidays when "little and often" is so important to keep the children fresh and alert.
dams, I would consider Learning Labs or possibly even Walsh in preference to the Level 4 papers, because she is obviously coping well with the vocab. Break each test down into two 25 minute papers. The moment she seems to be demoralised by a poor result, give her an easier paper - the Tutors full length papers on here are good for that. Again, break them down into two halves.
In September you can hit the Susan Daughtrey Bright Sparks and GL Assessment full-length papers.