I also don't know what you're saying - preparing for an exam 1 day after it is held??????
I think one issue is English is not your first language (mixing up before & after??) - am I right? If the language barrier is an issue, you'll need tutoring.
As for quick studying - you can't study pharmacology quickly. If you do, it will leave you as fast as it went into you.
You must study it slowly & completely. You'll have to study it the way it is being taught to you. But, most schools will teach it according to drug "groups" - the antiarrhythmics, the anti-emetics, the benzodiazepines, etc.... Learn the "prototype" drug - chlordiazepoxide or diazepam for example....learn the mechanism of action, the side effects, the kinetcs, the dynamics, the dosing & administration, the toxicities & overdose profiles...then - learn the rest of the group as variants off the prototype. For example, some benzodiazepines have no active metabolites - thus they are good for situations when you don't want the duration of action to last long or accumulate. However, when there is an active metabolite - that will work to advantage when using it for a long term condition - say dts. Shorter onset & no active metabolites work well as pre-meds - say for dentistry, MRI's, or other procedures.
So - get the idea???? Learn the drugs slowly & completely. You'll have less panic if you don't feel you have to pull out random facts. If you really take the time to learn the material, the facts will make sense & it will be more like knowing something which you take for granted right now - driving or packing a suitcase.....