My bad, yeah in Unit 2: 112/140 UMS = A
Unit 3 (ISA): 48/60 UMS = A
Ouch! 1 mark away from an A.
Getting a scrape A does not mean you got full raw marks (neither does getting 100% UMS). In your case you got 78/100 Raw marks (111/200 UMS) - still needing 21 marks (99/100) to get 100% UMS, and only 1 more mark (79/100 Raw Marks- 112/200 UMS) to get an A.
How can you not understand how you got lost that mark, you dropped 22 marks in the paper overall. So, it was either due to not understanding the question or just making mistakes. The markscheme (and question paper) is surely out now- so if you remember your answers, you can asses over them to find out where you made the mistakes. You should have asked your teacher last year to get the electronic script of the paper you did, therefore you and your teacher could go over your mistakes- and would have considered if it was worth getting it remarked.
http://web.aqa.org.uk/UMS/index.phpUse it to help you understand the grade boundaires.
Qualification: AS
Series: June2011
Unit: CHEM2 - GCE CHEMISTRY UNIT 2
Click the "Convert one mark" - and then the field will be highlighted, and below it will say "Enter you raw mark" (for you, it will be: '78').
Note: Each time you select a field, the page will refresh for every stage.