Read the following at this website:
http://damascus.usembassy.gov/visas/non-immigrant-visas/frequently-asked-questions.html
Can I get two different US visas at the same time (such as F1 and B1)?
Yes, it is possible, and in fact quite common. Many people find that a B1/B2 visa gives them more flexibility if, say, they plan to visit the US for tourism more than one month before arriving to study (the F1 only lets you enter up to 30 days before your studies begin).
http://damascus.usembassy.gov/visas/non-immigrant-visas/frequently-asked-questions.html
Can I get two different US visas at the same time (such as F1 and B1)?
Yes, it is possible, and in fact quite common. Many people find that a B1/B2 visa gives them more flexibility if, say, they plan to visit the US for tourism more than one month before arriving to study (the F1 only lets you enter up to 30 days before your studies begin).
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