choosing the right books for essex

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hi!my dd is preparing for essex exams and is currently doing bond 4thpapers for maths and english.she manages 2 get a respectable score of 80-85% on avg.should i b getting more 4th or 5th papers in bond series?right now she is pretty confident while doing 4th papers.i really dont want her 2 lose confidence by going for something that she finds too difficult.any suggestions as to how to intensify her preparation while keeping her confidence intact as well.thnx