I just passed the broker's exam in California. I used lumbleau.com to study and if I had made it through all of the study materials I would have been very well prepared, I did make it through about 3/4 of the materials and did pass the exam on the first try. If you have your sales license and are not planning on doing this long term, why are you looking to get the broker's license? It will take several months to process the application, sit for the exam, etc. With your time frame, you might be better off working on a business plan and finding ways to bring business in right now.
I am a new agent and I did go directly for the broker's license because I am planning long term and did not want to study for a new exam take more classes, etc. at a later date. I am also an appraiser and I found it difficult to find the time to upgrade that license while working full time.