If you have watched all of our lectures, then you do not need to read the Study Text. But you must have done one or the other, otherwise there is no point in practicing MCQ’s.
With regard to tackling the MCQ’s, they are not all the same level of difficulty, so best is to go through first looking for the short, easy ones, and leaving out the harder,longer ones. Then go back and try the hard ones, but any you cannot do, or any you do not have time to do, then you should guess an answer. You must make sure you hand in 20 answers however many of them you have needed to guess.