Congrats on your verbal section! At least buy a book if you want to try and imporve your math score. Also, if you don't want to buy a course, you can look into online self tutorials (which is helpful since the test is computer based), or even finding a math tutor (a few hours of a math tutor can be a lot less than a full course, and help you out withthe concepts you find most dificult).
Not studying works for some people, and doesn't work for others. It really depends on who you are (personally, I need to study!)
Good luck!!
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