There was a lecture about the mid-semester exam in the week leading up to it, with some practice MCQs in it. I didn't go (future health sci students - I had a good excuse! Definately would not advise missing lectures otherwise!) but listened to the recording and they didn't use remotes (I don't think).
Anyway, the MCQs there were pretty easy.
What I do remember is doing about a third of the 1st study question sheet, marking myself against the model answers and schedule given, and only getting 80%. That was when I started to learn all the details in CELS (along with HUBS and later BIOC), as is required. I didn't actually find this that difficult (two weeks later, in the actual CELS mid-semester exam, I got 94%), I just needed the realisation that the tests demanded this. Looking back, one of the things that really caught me out was a "compare and contrast" question on that study sheet. Under NCEA, a full scoring answer to a compare and contrast question involves just that - comparing (pointing out 3 similarities) and contrasting (pointing out 3 differences) with no further development - the hard part being that you often had to work out the similarities and differences yourself, and sometimes they had to get quite abstract. In those CELS study sheets (based heavily on past exam questions) the perfect answer was pointing out 1 difference and/or similarity (which were generally quite simplistic, such as "chloroplasts have 3 membranes and mitochondria have 2") and then elaborating from that difference or similarity by covering all the related details (such as "the inner membrane of the mitochondrion is folded into cristae"), the hard part being covering those details. It was a relatively minor point, but one that cost me a couple of marks. Having said that, only some of the SAQs in CELS require you to mention minor points (those are mainly tested in MCQs). The problem is you can't really tell which questions will be marked harshly so have to approach them all as though they will...