Welcome to White Rabbit Japan!
If you want to experience the JLPT N5 under real test conditions before you take on the real deal, you should definitely give the JLPT N5 Official Practice Workbook a try. This book works best to use for revision, after you have learned the kanji, vocabulary and grammar necessary for the JLPT N5. Why? Because it is structured like the real JLPT N5 all the way to the time you are supposed to complete each chapter in.