Congrats on making the decision to go ahead and work on your GMAT prep now. Since scores are valid for 5 years, it certainly can make sense to go ahead when you think you have the time and can make that commitment, and do the preparation and take that test. We also find that those who are still in undergrad or just out of it often perform even better than those who have been out of school for a while-- perhaps the math is fresher, or you are just more used to studying and taking tests.

A great first step is always to take an initial practice test. This will expose you to the types of questions you'll see on the GMAT as well as the format/experience, and will provide you with an assessment of your baseline/starting score and strengths/weaknesses. Don't focus too much on this score, but do use the results to get a feel for what you'd need to work on most. We have a practice test on our website, as do most other prep providers, plus GMAT Prep is a free software option from the testmaker.

From there, you'll decide what type of prep option is best for you-- a live class, online class, tutoring, etc, and what company to prep with. Do your research, ask around, and attend free events at a few companies, online or in person, to make the best choice.

Good luck!