Here are a few comments from the markers:

Many problems with row and column space.

Questions 1 and 5 were well done.

Question 3 - some incorrect use of inner product space definitions
(dot product in a complex vector space).

Question 9a - some trouble setting up the question.  ie.
declaring vectors.  Also, most people did not consider whether the zero
vector was contained in the subspace.

Question 10 - very poorly done.  Many didn't even try and those
that did, did not seem to give it much effort.