i went through the kaplan online courses as well. they mention that if you're getting 60% and higher, you're in pretty good shape. i really don't understand their grading system.. but i was consistently getting high 50s and 60s and passed the nclex in 75 questions. aside from the kaplan questions, i would recommend going to b&n and doing questions from different nclex books as well. it'll expose you to different types of questions with different formats and ultimately make you feel more comfortable when you're sitting for the boards. good luck!