Can you explain further about the immigration status thing? Does you dad earn income in the US and file taxes? How about your mom?
You don’t have to pay $6300. $6300 is subtracted from all of your income(including taxable scholarship/grant amounts) and you owe a percentage of the remainder as tax). If it is legally true that no one can claim you as a dependent on their return, then the amount subtracted from your total income before the taxable amount is arrived at will be $10,300 for 2015.