Figured bass
Grade 6's figured bass on a bigger scale, in stages: the figures revisited, planning a long bass, the 7th in the bass, the diminished seventh in minor keys, the soprano first, and full realisation.
Start with Figures revisited. In 10 minutes you will be able to name chords from figures, sevenths included.
Lessons
Practise and test
Brainlag's own Grade 7 level course, not an exam board's syllabus. Every example and question is original. Results are Brainlag estimates.