I have used Magoosh and they are not bad at all.
However, if you are nearing your test date, then I recommend doing the OG questions. Since I had already done OG 12, I did last 25 questions of each section on OG. OG will set your mind in the right direction as to what to expect in the test.
My GMAT score wasn't great but I blame it on myself and am determined to get better. 640 (39Q, 38V), 6/6 AWA

i started preparing for this exam in august, and i finally took it today. i have done all OG questions, Kaplan was hard for me, Math is not something i am great at, i have been an average student all my life, my main focus was to get the maximum score in quant, but i dont know what happened, but i ended up with 380. i was getting 550+ in all of my kaplan tests.
I am thinking about re-writing this exam one last time, if i still dont get a good score, then maybe this really isnt my cup of tea. I am not aiming for universities such as harvard and standford. I'll be more than happy if i get a score in the 600's

what should i do at this point if i target to rewrite this in end of january, i know my mistakes and i know where i went wrong. but can i improve my verbal at this point?