NEED HELP IN QUANTATIVE SECTION( MATH)

Hello all,

I recently took a practice cat and got a very very disapointing score.. Lets just say its around low 400. EEEK. I obviously need more practice and math and need to know if there is any practice that has helped anyone immensly. Math has ALWAYS been the struggle in my life and continues to do so. I am currently doing the Manhattan GMAT books for math which are good. But i would like to diversify and get the optimal practice. any tricks or tactics? Any suggestions?any chance of hope?????

thank you
sincerely,

Math frustrated.