Underachieve

Hello everyone. I'm currently an undergraduate Junior in the process of getting an Accounting degree. I plan to continue by getting a Master's, then a CPA, and ultimately applying for grad school. I'll also actively be seeking a job and hopefully working to fulfill the CPA work requirement. Since I'll be much busier starting my senior year, I was wondering if studying and taking the GMAT as a junior (when I'm still relatively free) would be beneficial for me. Has anyone taken the GMAT before graduating? Is there any downsides to taking the GMAT this early? I know the scores are relevant for 5 years, but I've read that schools want more recent scores and was wondering if they'd penalize me for taking the test early, versus doing it closer to application deadlines.