http://www.boardofstudies.nsw.edu.au/syllabus_hsc/pdf_doc/maths-general-syl-2013-and-beyond.pdf
http://www.boardofstudies.nsw.edu.au/syllabus_hsc/pdf_doc/maths23u_syl.pdf
P.S It is illegal to post copywrited PDF's on BOS
Check out this guy for HSC Mathematics video...
http://www.boardofstudies.nsw.edu.au/parents/parentfaqs.html
If the N-Awards are in different subjects, then your son may well be fine to continue into year 11 (but I think you need to have an over 80% attendance rate or something? )