I guess it depends on why you "didn't do really well in my 2nd year".
Were you skipping lectures and just not putting in sufficient effort generally, or were you trying your best but just struggling to make sense of the content?
If the former, then the solution should be obvious. If the latter, then perhaps you need to try some different approaches to learning - given that whatever you're doing right now clearly isn't working.
What advice has your personal coach provided? (I assume you asked for advice.)
Do you know what proportion of your final grade comes from your third year marks?