It varies - here is a quick rundown: 30 math (grade 8 level) 60 spelling 50 reading comprehension 90 natural science including biology, chemistry, health safety, physics (?) and basic science.
Sorry - no formula sheets are allowed!
Check with your school - I believe a computer based and paper format are available but not at every school
Yes this is a multiple choice test
Yes you can use scrap paper which is provided.