Start at Level 3, then go onto Level 5. If you start at Level 5 then you will be missing out on vital learning that isn't covered on the Level 5. It is even more extreme at Level 7. Dealing with HR procedures as a manager is totally different to working in HR. The big mistake a lot of people make is by thinking of the Levels academically when you need to think of them as professionally. There has been threads on this subject in the past