Study Books

Hi,
I passed Book Keeping Level 1&2 (First Class Passes) about 4 years ago. I have therefore been exempt from Level 2 AAT and started at Level 3 instead. I'm struggling in some areas and wondering whether it may be useful to get some extra study books maybe from Level 2 and do some swatting up. Could anyone advise? There seems to be so many books!
Any advice would be much appreciated!
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