I have been a piano teacher for more than 20 years. In my years of practise I have prepared many students for exams. While students find it relatively easy to learn a single scale, they are often having a hard time memorising up to 9 scales for an exam. The most probably cause is that scales are gradually thought month by month and students usually don't practise more than 3 scales at a time. Before an exam they often start mixing up the keys and the proper fingering associated with each scale. Therefore, after trying different approaches, I came to the conclusion that the best way to help them is to use printed pictures of the keys and the proper fingering besides the music notation. 

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Below you can find all the scales and arpeggios for the ABRSM exams ordered by grades.