In my opinion, the Magoosh math videos coupled with their questions and the Manhattan 5lb book can propel your quant scores to near perfect (or even perfect) ! To make your study more effective, watch all the Magoosh videos on a topic and then solve the Magoosh and Manhattan 5lb book questions.
I had studied from these sources and scored a 167 on the quant section.
And 100$ for Magoosh is a good investment, considering that you'll have to spend nearly double that amount if your scores don't match up to your expectations and you wish to retake the exam.