Grade 5 music theory is required to progress to higher levels on the ABRSM syllabus. But it is not compulsory on previous grades, what leads you to be lost when you open your Grade 5 music theory book for the first time ever. It is an ABRSM curriculum controversy we teachers need to roll up our sleeves and get to work on.
The right time to do your Grade 5 music theory is together with your Grade 5 practical preparation. However, you would need a strong background and foundation in your instrument to be able to follow the classes with ease. Being familiar with previous grades’ contents will massively help you succeed in your Grade 5 music theory exam.