The leech thing doesn’t actually work anymore apparently (it never did for me and I was never bothered to look it up until now)
If what you want to do is train leeches, use the self study quiz with the additional filters
If what you want is to see your leeches, get the leech tables.
If what you want is to see in what SRS level your leeches are located, get the Dashboard SRS and leech breakdown.
If you want all three, then, get all three.