Aye to wire core although i do not think it is compulsory for cs38, better check. Try to get handy with the throw bag, save you many change overs and will give you more time to reach your targets.
Cambium saver.?Until you get your saw from harness, chances are you will be doing much work with pruning saw, hence retaining tree.Efficiently positioning saver in tree with use of throwline ,again maybe not compulsory but will be impressive in exam. Couple lengths of climbing rope is handy. I usually have 20mtr and 40mtr length ropes on site. Revise criteria for exam in blue handbook. Think safety then efficientcy. Mind the stopper knot on c/rope, i forgot that a few times!
Good on you man for doing the exams, solid founds an' aw that.