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ABRSM have produced a set of apps to support students doing their grade exams. They can help you practice scales, aural tests, theory, and sight reading. Some apps are free, and others you have in-app purchases for the grades you need. However they're well made, and good value.
Amongst others, there are also apps for the exam pieces for voice, piano, woodwind, and strings. Check them out here:
https://gb.abrsm.org/en/exam-support/apps-and-practice-tools/