Not that many people drop our of Acst by the end of first year. As a rough estimate it would be about 10-15%.
As for second year, people often repeat subjects (for a couple of year before dropping out) or they make it. I could only guess and say 20-30% will drop in second year. However, if they try again and fail to make progress, they'll leave in their third year (when they were studying second year material).
I'll be able to give you more statistics by the end of next year. And hopefully, I won't be part of the casualities.
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Anyway, I'll keep telling myself, next year, that second year is the make or break year... so it's all or nothing; no holding back!
And then, in third year, I'll keep telling myself, it's the home straight, etc.
And fourth year, I'll tell myself, it's Control Cycle; go for broke.
Essentially, no letting down from now on.