Dude at 570 there are certainly visible loopholes in your content knowledge/practice. I would suggest you to get a cheaper tutor or Grockit or even post your scores, materials used, weakness, strengths on BTG/ GMAT Club forum. There are lot of people who would suggest you something. Then you can decide whether to invest 450$ in MGMAT.

I agree with AbhiJ. Post your individual scores, number of mistake by section wise as well as topic wise. Then a lot of people/experts here are ready to help you.

Following are my numbers from MGMAT assessment tool. I have gone back and reworked on the topics listed as worst. But have not seen little difference:(. Its not that I dont understand the concepts I do and have little difficulty when solving problems from OG.

VERBAL: ANALYSIS BY QUESTION FORMAT & DIFFICULTY
QUESTION FORMAT Total Right Wrong Blank % Right Average Average Average Average
Time Time Difficulty Difficulty
RIGHT WRONG RIGHT WRONG
Answers Answers Answers Answers


Critical Reasoning 91 48 42 1 53% 2:03 2:08 560 640
300 - 500 12 11 1 92% 1:50 1:50
500 - 600 36 20 16 56% 2:07 2:12
600 - 700 22 11 11 50% 1:59 1:45
700 - 800 21 6 14 29% 2:22 2:22

Reading Comprehension 75 43 32 0 57% 1:44 2:03 580 640
300 - 500 11 7 4 64% 1:19 1:34
500 - 600 24 17 7 71% 1:35 1:53
600 - 700 22 16 6 73% 1:57 2:44
700 - 800 18 3 15 17% 2:31 1:58

Sentence Correction 92 41 50 1 45% 1:29 1:34 570 610
300 - 500 13 9 4 69% 1:13 1:47
500 - 600 30 12 18 40% 1:39 1:27
600 - 700 39 20 18 51% 1:31 1:31
700 - 800 10 0 10 0% NA 1:48


Assessment Summary
QUESTION FORMAT Total Right Wrong Blank % Right Average Average Average Average
Time Time Difficulty Difficulty
RIGHT WRONG RIGHT WRONG
Answers Answers Answers Answers
Problem Solving 154 81 72 1 53% 1:56 2:28 620 670
Data Sufficiency 105 50 55 0 48% 1:32 1:50 600 680

Sentence Correction 92 41 50 1 45% 1:29 1:34 570 610
Critical Reasoning 91 48 42 1 53% 2:03 2:08 560 640
Reading Comprehension 75 43 32 0 57% 1:44 2:03 580 640
QUANTITATIVE Total Right Wrong % Right Average Average
CONTENT AREA Time Time
RIGHT WRONG
Answers Answers
WORST Word Translations 68 30 38 44% 2:02 2:38 SLOWEST
Geometry 33 17 16 52% 1:41 2:09
Number Properties 48 23 25 48% 1:42 1:52 FASTEST
BEST Algebra 61 37 24 61% 1:32 2:20
FDP's 49 24 24 49% 1:58 1:42

For SC/CR you have 50% accuracy in 500-600 level. This is pulling your score down. Your RC is in a decent place. Have you followed Manhattan SC and Powerscore CR/Veritas Prep CR? By following I mean reading a book 2-3 times, making notes, revising.
You need to solve OG12 2,3 times and review the explanations in OG.


For Quant your best/worst section have 50-60% accuracy.
So in general you can improve a lot in Quant.
My suggestions: there is an unknown book in GMAT community. This will help you in your fundamentals which would ultimately push your accuracy to north of 75% in Quant. Just use the look inside feature to see if it appeals to you.

https://www.amazon.com/GRE-GMAT-Math-Sys ... 1453633987

Once you finish this book you can try to give a number of sectional tests for practice:
from
a.) Mangoosh
OR
b.) GMAT Club tests.
I like GMAT Club tests as they offer 25 tests. However I must say Mangoosh Quant questions
are pretty good too. Just use the free questions they offer as preview to make a choice.
Magoosh offers 100 Quant questions if you are GMAT Club member.
GMAT Club offers 1-2 free sectional tests.