How to calculate GPA nd improve verbal

hi all!!!

I am a MS in Bioinformatics from Chandigarh, India. I want to apply for PhD and am giving my GRE soon… I have been giving the GRE mock tsts and ne test available online… I am able to manage quant wid 780 or so bt verbal… really bad… nt able to go above 450… wht shd I do?? trying to memorise bt nt getting it… ne suggestion… plz help!! :?:

Also I would like t know as to how to calculate GPA… I am standing 2nd in my university wid 77%.

Thank you for taking time to view my query!!

Any reply would be highly appreciated