The NCLEX® is prepared by the National Council of State Boards of Nursing (NCSBN).
Each state requires that you pass this exam to obtain a license to practice as a registered nurse.
The designation registered nurse or R.N indicates that you have proven to you state board of nursing that you can deliver safe and effective nursing care.

The NCLEX® is a test of minimum competency and is based on the knowledge and behaviors that are needed for the entry-level practice of nursing.
This exam tests not on your knowledge, but also your ability to make you competent nursing judgements.