Georgetown is a great school and I sincerely hope you get a 173 LSAT, but a practice LSAT is practice. I know many people in your position myself included as 0L get ahead of themselves and start thinking about the school they will attend etc. It is kind of exciting.
However, realistically what should focus on is getting an LSAT score once you have a real LSAT score and your GPA is officially done you will know your options. If you get a 173 LSAT and have a 3.81 GPA your chances are solid and just an FYI lawschoolnumbers.com is a great site to see what numbers will get you into what school.
With all that said something to really understand is that any ABA law school will teach you the law and give you the skills to become a successful lawyer. It is true schools like Georgetown, Harvard, Yale etc will open the door to Biglaw, but I know a number of Harvard grads who worked at Biglaw hated it and went on to work at a D.A., Public Defender, City Attorney etc where you don't need the Harvard Degree to work, but they have a lot more debt.
A lot of incoming and current law students get very racked up in the rankings and attending the "highest ranked" school, but the reality is no matter what school you attend you will read Supreme Court cases and learn the same thing the law is the law period. The Supreme Court does not write separate opinions for different law schools.
Anyways, just focus on getting your LSAT score then you can know your options. Once you have the score think about the location you want to attend school, consider the tuition costs, and visit schools to see, which one is a fit for you. When I was choosing I visited a number of schools some were great to me others sucked, but that was my personal opinion you could very well love the schools I hated and vice versa.
Good luck on the LSAT and your pursuit of a legal career.