If you're trying to learn pharm in such a short time period, my best advise would be to just learn the major classes and their sub categories, their big hallmark side effects and corresponding endings.
Like "olols" are Beta Blockers
Or "prils" are Ace Inhibitors and cause a dry cough
so on and so forth.
one thing that REALLY helped me learn pharm was making charts for all of these Meds based on class and color coding them. In my charts I included drug name, action, dx used for, desired effect, side effect and contraindications. i created charts in word (and even went a second time and hand wrote them on plain printer paper). I color coded my charts based on system action. Such as cardiac, respiratory, sedative, NSAID.
Hope this helps! Best of luck!