<p>In addition to the simple differences in weighting grades (an A in an AP course in one school might be valued as 4.0 plus 1 value added bonus point while in another school, an A in the same AP course is valued at 4.0 plus .5), schools have differing grading SCALES, such that a 92 at one school is an A while an A at another school is a B (depending on if school has a ten point or 9 or 8 or 7 point grading scale). </p>
<p>A student with an A in an AP course at a school with a ten point grading scale (90-100 = A) and a 1.0 bonus value for AP, could get a 5.0 for a 90 in the course while a student who gets a 90 in a school that uses a 7 point grading scale (93-100 is an A, 85-92=B, etc)) and only gives a .5 bonus value for AP, would end up with a 3.5 for the exact same AP course.</p>