This is funny. I pondered this exact same question a year ago. I'm also from the island but I went to school stateside. Before you enroll at UPR Law, keep in mind that UPR teaches in Spanish and their courses focus on PR civil law and some federal common law.
Spanish: during your first year, you will learn the law and the legal jargon in Spanish. You will learn legal writing in Spanish. After a year, when you head to the states (if you do transfer), you will be challenged to do your legal writing in English as well as learning the same legal jargon in another language. I can see this being a challenging transition.
Civil/Common Law: the PR law schools will teach you the law, both civil and common law, but their focus will be in the PR civil law system even during your first year. Read the course offerings and you will notice that most course offerings are in civil law and that your first year will focus on this legal system.
Now, if you want to study in the states, you should do one of three things. Study better for the LSAT (which I know is a very hard test for Puerto Ricans and Spanish speakers) and aim for an American school. You can wait a cycle, apply to schools in the states with your numbers and add a addendum (which is what I did and got me to T2 and some low T1, but had higher numbers than yours). You could go to UPR Law, get good grades and either transfer or do one of the joint degree or study abroad programs UPR has with UConn, U of A, Chile, Canada or Spain. I pondered the third option a lot and almost did it but chose the second option because of my career goals (and the fact that UPR loves to go on strike every year or so and their infrastructure sucks). Think of what you want to do and where you want to practice. Do you want to practice in PR? Then UPR is your best bet. La Inter is really for UPR rejects and la Catolica... just tell me who in their right mind wants to live in Ponce.
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