I have been an LPN for 15yrs, just graduated from nursing school in May'08. I had a very difficult time trying to support my and attend nursing school at the same time. I barely made graduation. I failed my first NCLEX end of July,08. I thought I was prepared to take the test. May have been my nerves and/or studing from too many sources in retrospect. The questions were similiar to what you have studied.
I recommend working as little as possible if you have a choice. Although I have many yrs of experience as an LPN, the RN is on whole other level of care and management of a patient.