HI.. i'm one of those successful students of NCSBN learning extension who ended up passing the NCLEX just last December 12 only. Before, i have the same feeling as yours, and i think its normal just what Ms. Andrea have said to feel like that, especially when you started your review and plan to take NCLEX. The anxiety level is very high. I, myself, can prove it right also!

• I can only advice you things which I made it, and passed the exam. First, I make a PLAN for my review, and stick to it! No matter what happen, I see to it that I achieve my everyday goal. 
• Exercise with proper diet also helped. if the mind and the body will work together will provide good results.
• I sacrificed a lot! sacrifice in going out for movies, going out with friends, doing my favorite pastime, etc. I sacrificed all of these within 2 months. and I only FOCUS on NCLEX review. I made my review as a hobby anyway, and have a daily target of test results. I started out at 20/75 questions, so disappointed and so scared like you. But as days passing by, I began to contemplate on how to deal with questions with everyday practice.... as in everyday practice questions. DO NOT STOP! push yourself until u get the score what you want. Dream on! 
• Then try to relax as the NCLEX exam date is getting nearer, CRAMMING and RUSH REVIEWS will not help you anyway. Be sure, 1 week before your NCLEX exam, you should be relax already and have again a plan of relaxing activities. 
• AND LASTLY, PRAY and MEDITATE! THIS WILL HELP YOU TO ACHIEVE SUCCESS. Prayers are helpful not only in exams but in our everyday lives. Remember that!

NCLEX e-LEARNING review helped me a lot and I owe a lot from this, especially to the staffs and MS. ANDREA who guided me till I succeed. THANK YOU GUYS and GODBLESS!

-Angel in the sickroom-