Hey rysul119,
You have ample time for practice before the exam. That being said its never too early to start preparing for the tests.
Usually the students follow the following algorithm for Quants.
1. Start with a simple GRE test and observe the results. Based on your results you can evaluate the topics in which you are strong and weak.
2. Once you have identified your strengths and weaknesses you can start dedicated study of the individual topics. Here our own website might be a useful resource. Our Tagging system lets you choose from the topics. Since it is an ever expanding website you can find many questions.
Here is a complete list of topics 3. After you have practiced your weaknesses away retake the tests available to re-evaluate your position. And practice more if needed. since there are ample free tests available online you should be able to repeat the above process multiple times.
Best of Luck,
Leave a reply if you need clarification.
Regards,
PS: Personally I like this resource for self study
LINK