On your asking I want to say GMAT score scale consists of five parts:
Verbal Scaled Score (on a scale from 0 to 60)
Quantitative Scaled Score (on a scale from 0 to 60)
Total Scaled Score (on a scale from 200 to 800)
Analytical Writing Assessment (AWA) Score (on a scale from 0 to 6)
Integrated Reasoning Score (on a scale from 1 to 8)

GMAT scores scales from 200 to 800; two-thirds of test takers score between 400 and 600. Verbal and Quantitative scores range from 0 to 60; scores below 9 and above 44 for the Verbal section and below 7 and above 50 for the Quantitative section are rare, The total GMAT Score is a scaled combination of the verbal and quantitative scaled scores, and thus reflects a student’s overall performance on the multiple-choice sections of the test.

The following table shows the 61 possible GMAT total scaled scores and the percentile rankings assigned to each.
Scaled Score Percentile Scaled Score Percentile
760-800 99 520 36
750 98 510 34
740 97 500 31
730 96 490 29
720 94 480 27
710 92 470 25
700 89 460 22
690 87 450 20
680 84 440 18
670 83 430 16
660 80 420 15
650 77 410 13
640 72 400 12
630 71 390 11
620 67 380 10
610 64 370 9
600 61 360 8
590 58 340-350 6
580 54 330 5
570 51 310-320 4
560 48 280-300 3
550 45 250-270 2
540 42 220-240 1
530 38 200-210 0

The verbal and quantitative scaled scores are also assigned percentile rankings. The following table shows the possible verbal and quantitative scaled scores and the percentile rankings assigned to each.
Verbal Quantitative
Scaled Score Percentile Scaled Score Percentile
45-51 99 51-60 97
44 98 50 88
42 96 49 79
41 94 48 74
40 91 47 68
39 89 46 66
38 85 45 63
37 83 44 58
36 81 43 56
35 76 42 51
34 71 41 49
33 69 40 47
32 66 39 43
31 61 38 41
30 58 37 40
29 56 36 36
28 51 35 33
27 46 34 31
26 43 33 30
25 38 32 27
24 36 31 24
23 32 30 22
22 30 29 20
21 26 28 19
20 22 27 16
19 19 26 15
18 17 25 13
17 15 24 12
16 12 23 11
15 10 22 9
14 9 20-21 8
13 7 19 7
12 5 18 6
11 4 17 5
10 3 14-16 4
9 2 13 3
7-8 1 10-12 2
0-6 0 7-9 1
0-6 0

The following table lists all of the possible AWA scaled scores and the percentile rankings assigned to each of them.
AWA Score Percentile
6.0 92
5.5 81
5.0 60
4.5 44
4 21
3.5 13
3.0 6
2.5 5
0.5-2.0 3
0 0

Integrated Reasoning

The Integrated Reasoning section is scored on a scale of 1 to 8, in one-point increments.
Score Percentile
8 92
7 81
6 67
5 52
4 37
3 25
2 12
1 0