Do i have enough time

Five weeks should be fine. Depending on your current knowledge base, you could probably just study steadily over the next few weeks, rather than like mad. You can always take a practice test (either from a study guide you have or the official ones you buy off of ATI) to see where you are/what you need to study. That will tell you how much you need to spend on studying.

I studied on and off for like a month or a month and a half and made a good score. The test isn't necessarily difficult in the subject matter, more in how extensive the science can be and perhaps how little one may use some of the math concepts.

Sure! Take a few practice tests (you don't need to pay for these--there are plenty of free ones) and narrow down the topics you need to brush up on. For instance, I realized I needed to review certain grammatical terms that kept popping up in the practices tests, and that I was pretty hazy on the difference between the lymphatic and endocrine systems. I suppose it's actually possible to learn everything in 5 weeks, but it's good to focus on your weak points--once you know what they are. Anyway, worked for me!