Hey there! I studied for the GRE with Kaplan. I bought the online version which came with the study guide(huge)and printable vocab cards. I was a little nervous about the GRE because it had been SO long since I graduated from high school. So, I was a little nervous. I've taken the GRE 5 times....ha,ha,ha...Yes, you read it correctly! Over the years, I've improved my scores, but most importantly, I think its all about test logic. I just got "good" at taking it. I think if you are weak in vocab, by all means learn the list of 1000 words they recommend in all the study guides. This helped me a ton. In addition, the quant section can be crazy because it may be basic but its also very analytical, so do as many tests as you can! I studied for about 6 months before I took each test. My first GRE was a 1250(6 on the writing), then up it went to 1480(5.5 on writing) with Kaplan, so its really up to you!
I'd give myself enough time to take it over if you have a bad day or need extra time. In addition, if you go on Kaplan's website, they offer free "tests" that you can register for. They like to get you in there to sell you their product, but its free to anyone, so try that! You don't have to buy Kaplan products or anything to register to take a test at one of their sites. Its worth it in my opinion to get an idea of the actual test itself.
My highest score happened when I actually set out a plan of studying. I did vocab cards one day for 2 hours, math another day for 2 hours, writing for 1 hour. I did this about 5 days a week for 6 months and I really did much better. You'll do great. Just jump on in and try your best. And remember, its not the "end all, be all" of the world....Its just a test. 🙂