Hi cheeks. Read as many chapters as you can. I think it is not how many hours or months you have studied or reviewed? It is how much concept you have understood and retain. Because the exam is an application of the concept how the drug works (and the likes). You have to choose the BEST answer so UNDERSTANDING is the key. So I suggest that you keep your pharmacy technician job, remember not everyone is lucky to have a full time job. And I think that working as a Pharmacy tech will help you have an idea with the US Healthcare system so take advantage of it. Just study during your free time, maybe you can make a timetable to better manage your time. You still have 3 months to prepare so don't worry too much coz most of the time worrying just make you out of focus thus a waste of time.
By the way, how did you apply as pharm tech? maybe you can give me tips. I'm from CA, what about you?