All companies are equally good, try to watch the videos of the different prep companies on youtube or their website, you will get a gist because at the end of the day you would like to have a course which suits your demand.You can go through the reviews also to know what others feel about that course.The duration is important because you would have to set time according to it and you would need time for self prep too.You can try e-GMAT
free modules on its website,
Get some more books such as, kaplan verbal workbook
(to start with because you are already hitting with 60% accuracy), Powerscore CR
bible (must have) , Manhattan Series, Aristotle RC (very good ), Aristotle SC , GMAT GRAMMAR BOOK etc to reinforce the basics.
" Make more efforts "
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