Attend Classes as Frequent as You Can

Well.... to get full or maybe almost of the informations and knowledge of a subject, you need to attend the classes.

Besides the modules or notebooks, there might be some extra informations that will be given by the teacher/lecturer.

For calculation, mostly you need to be teached by another person that know how to do the calculating methods.

Maybe some of the topics can be learnt and can be done(calculating) just by reading the books, but some also need to be explained and need to be shown.

If you skip the class, ask your friends or someone to teach the topic(s) of subject(s) that you do not understand.