SQL Server 2012 :: Row Number Over Partition

I am having problems getting my last revision number out when i am trying to use inner joins along with the row_number over partition

I am using 2 tables, tbl_acyear_lookup & tbl_targets

tbl_acyear_lookup columns = (pk)- academic_year_id, academic_year
looks like this:
1, 2010/2011
2, 2011/2012
3, 2012/2013

tbl_targets columns = targetID, Academic_Year_ID,Course_Mode,UK_ENROL, INT_ENROL, Notes, Revision_Number

I have one stored proc that uses the Row_number over partition that looks like this:

Select TargetID, Academic_Year_id, Course_Mode, UK_Enrol, Int_Enrol, Notes, Revision_Number from
(SELECT ROW_NUMBER() OVER (partition by [Academic_Year_id] order by [Revision_Number] DESC) as [RevNum],TargetID, Academic_Year_id, Course_Mode, Target_Year, UK_Enrol, Int_Enrol, Notes, Revision_Number
FROM tbl_targets where course_mode=@course_mode) RV where (RV.RevNum=1)

Now the next store proc needs to use the above but i need to add the Academic_year from the tbl_acyear_lookup table also add filter the target_year ='year 1'