I'm not sure they have even made new textbooks for the new JLPT yet. As N4 corresponds to the old Level 3, I think you'd be safe to study from an old Level 3 textbook.
It might be worth it to get the mock test. Most of the grammar questions are similar on the new test, but the listening is quite different. It would probably be good to study the listening a little bit before the test.
thanks for your input guys, really appreciate it. im going to go through the minna nihongo beginner II first to brush up. then may get some of those books whiterabbit has.
It depends on where you live, but in general, it's held twice a year in Asia (July and December) and once a year pretty much everywhere else (December).
Please check all the question types you'd like to use. You can also select the difficulty level of each question type and how often the question type should be used.
Quiz modes marked with renshuu pro only available for renshuu pro users.