B2 visa extension...need help

[jjhhaayy]

hi guys, good day to all. i'm currently here at california now and i have a B2 visa but my I-94 will going to expired this oct. I'm going to apply an extension coz im going to take NCLEX but the thing is it takes 3-5 months for the processing and its only the 2nd month after i pass the application of nclex.

i need all your advice/help if my application for extension would be granted.