USA Student Visa F1 Question: Download USA Student Visa F1 Visa PDF

I have applied four times visa three time i was standing on f1visa2010 and 21st feb2012, i was stand on m1 visa. but i cant eligible?

give where i am lacking

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If they ask what guaranties if you are coming back to your country after your studies, i am Tunisian and i live in Saudi and i go to study in states if i will succeed in interview, my family are in Saudi working there?	Two bulb in sires (100watts and 60watts). Then which bulb heavy light?