AS level or A2???
If AS level was this linear?
This is flippin ridiculous - you need to give us the details on what subject you did.
If you did an essay based subjective this would kind of be understandable if you got a high C followed by a low A remark.
However if this is a STEM subject this just shows that the system is complete bullsh*t...
Either the remarker was really lenient or the first marker was harsh...
...at least you're happy