Yes, you have many options for location or institution when it comes to the B1 english test. However, you need to ensure that the location you will choose from is the one that has the legal permit. You surely don’t want to face the issue during and after you take the test, right? Keep in mind that you need to get the citizenship test soon so that is why you may not make the mistake even when you seek the institution for your test and its preparation.
If you don’t know where to go and what to do, then it can be a great idea to do online research. Aside from that, it is also good to ask people surrounding, friends and coworkers for instance. Before doing that, make sure first they are those who ever took such B1 English test as you will take for the certain needs and reasons.