Hm, interesting verbal results,
felipeangelm. In general, there could be two reasons why your RC score was low: 1) you're bad at reading, or 2) you missed some RC questions that you're perfectly capable of getting correct. And clearly, you're not bad at reading. Your CR results are really good. You just managed to do something goofy on RC this time around -- maybe a lack of focus, or some fatigue leaking in, or just reading too darned quickly? That stuff seems fixable to me if you really concentrate on developing a consistent approach to RC.
I'm not sure whether this will help, but
this (pretty generic) article on RC might point you in the right direction in terms of how to think about consistency on RC. But I don't think that you need to drive yourself crazy doing TONS of RC practice -- just enough to be confident that you'll perform up to your usual standards. Other than the RC on that last exam, you've been in the 75th-90th percentile on RC and CR, so there's no reason you can't consistently score in that range on RC.
For quant, I wouldn't overthink the arithmetic subscore. Basically, the GMAT shoehorns EVERY type of quant question into those two categories (arithmetic and algebra/geometry), and that isn't terribly helpful for test-takers who are trying to figure out what, exactly, they need to study. I suspect that you have some legitimate weaknesses that could use some attention, but "arithmetic" is too general to be helpful. Keep a close eye on what you miss on your practice questions and tests, and see if that helps you figure out which topics could use some extra attention. And there are some great people in the quant section of GMAT Club who can help you with all of that.
Good luck with your retake, and please let us know how it goes!