Cashing in my A level grades

So in 2009 (I think? maybe 2010) I sat BIO1, BIO2, PSY1, GEOG4 (A2 Geography) and got my grades which, to be honest, were pretty poor. This was at college and I quite half way through the second year.
I took 2 years out of college and worked full time. After deciding I want to go uni, I plan on resitting all my biology along with resitting a module of my Geography and completing the second year of my A2 Pyschology. I have checked the syllabuses and they are all still the same.

My question is, how do I add all my scores together? I'll be sitting these exams privately at a completely different college to previously. Does the college/exam board automatically does this? Or do I need to get in touch with the exam board? Or my old college? I have been out of school for 2 years so I'm not quite sure what happens and would appreciate if anybody can help me out. Thank you