Evaluation

Critical comments are also informative.
What don't students like?

"Equivalent" answers being marked wrong More
case sensitivity (I insist on this for element symbols)
numerical answers to different numbers of dp or sf than required (no longer a major issue)
Stepwise approach? More
30/3600 (< 1%) comments were negative about the stepwise approach
Too easy? More
98/3600 comments said it was too easy
46/3600 wanted harder questions (often as part of a compliment)
BUT
150/3600 comments said it was too hard