Is 90% advance or proficient
The abstract noun form of the adjective 'proficient' is proficiency.
Being proficient in dealing with numbers
adept. good. proficient. skillful. technical.
Yes.
with
That is the correct spelling of "proficient" (capable, qualified).
He was proficient in arts and crafts
No it does not. Proficient means average, and advanced is advanced.
Applicants must be proficient in Microsoft Word and Excel. he's a highly proficient diver.
Is 90% advance or proficient
The learner driver was classed as proficient in driving their car
Advanced. In school proficient is a B and advanced is an A
I am proficient in answering questions on wiki.answers.com
Job applicants must be proficient in Microsoft and Excel.
A proficient person is someone who manages there time wisely is efficient and get the job done.
You could say "nonproficient"; "unproficient" isn't really a "word" (you can say it, but it's unusual).