"This test has been proved to be factible to be done within the time provided if you have the skills." A better way to say this would possibly be: "It's a proven fact that this can be completed in the time provided if you have the skills." So instead of saying "proved to be factible" say "proven fact" Hope that helps!

No, this absolutely does not make any sense. The word 'factible' does not exist I believe in the English language. I would change it to this: This test has been proved to be easily completed within the time provided if you have the skills.