Sorry in advance for long post.
Having just taken/passed the test yesterday I offer my comments. FWIW I did self study, I purchased the ASA Remote Pilot Test Prep 2018 for reasons below. I also used the 3DR practice tests and went through them several times; also a good resource.
But I quickly add, the self study process may not work for everyone. Some folks do better in instructor led or otherwise structured learning environments.That said - look into:
Test Prep 2018: Remote Pilot (also available from Amazon).
It includes a
printed copy of the CT-8080 Computer Testing Supplement which is used in the actual test (Totally concur with
barefootbeachcombing - you
will want to be very familiar with that document since you'll be flipping through it back and forth quite a lot during the test).The Supplement provided with my ASA test prep was dated 2016 so although it was very close to what I used during the actual test it must be considered a study aid only.
The ASA prep also includes 5 free timed tests that are presented in pretty much the same way you'll encounter when you take the actual test. This added a level of comfort when I tested for real since I immediately had the familiarity with how the system worked.
I should add - none of the above are all you'll need to prepare since they are test prep and not the definitive information sources underlying the test questions. For that - use the materials others have referenced above.
If I can add some
hints in no particular order:
1) When taking the test (practice or real). Read the question, pause, then read it again; think it through. Now read
all 3 answers very carefully and choose the most best one (some jump off the page, others are subtle). Sometimes the wording (both in the question and the answer) can trip you up as it did me many times in my practice sessions.
2) When taking the live test, use the 'Mark' option to mark a question you are not sure of so you can come back to it. Don't stress out on one you can't quite noodle out because that will throw you off your game - mark it, move on, come back to it later. You have 2 hours for 60 questions. IFF you are properly prepared you should have at least 45 mins to go back over all 60 questions with focus on the ones you marked unanswered.
3) For new pilots and well before you take the live test, I suggest you buy a hardcopy (not download) of a VFR Sectional Chart for the area you will operate in. Study and get familiar with it. Search 'Aviation Sectional Charts' - less than $15. Consider also a VFR TAC if you operate around one of the 39 high density areas (especially one of the Class B areas).
4) Last but not least - make sure you understand AGL versus MSL and True versus Magnetic and when each is used!
Fly smart and safe - Cheers!