It's been 15 years since I took the NCLEX-RN. We didn't even do it on computers so I can't offer you much.
Sometimes it's how good you are at taking tests that matters most. I scored very high (not bragging) because (I think) I was really good at taking multiple-choice tests. Also, in my nursing program (ASN), all of our tests were written just like the NCLEX.
There are all kinds of tips to multiple choice like: Never pick answers with "never" or "always" (i.e., absolutes), for example.
If you go to:
http://www.google.com
and search for "multiple choice tests" there are a lot of sites that offer strategies for this kind of test.
I thought the best info was at:
http://www.clt.cornell.edu/campus/le...hoicetests.pdf
It's a pdf file so you'll need the Adobe reader.
Good Luck to you!!