Hello!
I just want to share little story that may help you.
I began preparations in September. I had some background knowledge, but the first mock(590) somehow frightened me

)) After the mock, my teacher asked me about the result that satisfies me. I answered: "Something more than 730!" I knew a little about GMAT at that time. The one thing I was familiar with was the average score accepted by Top-10 Universities. That`s why I was going for more than 730. Eventually, I got "something more than 730" - 740!!!
In my opinion, it is of great importance to determine what you are going for beforehands and to put realistic goals!