I assume you are talking about an H1B visa. You can change your status now but it will only be effective from October 1, 2013 so you will have to remain in F status until then
It's possible to change if you get h1b petiob approved and file for change of status. Consult with an immigration attorney.
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I see no reason why not. There is no prohibition for your to study on H1B and work part time or work full time and study part time.
Yes, but discuss with a local immigration lawyer.
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