Does it apply to trade schools that do not give college credits?
Here's the applicable section of the AMCAS instructions for this year:
How Do I Know if AMCAS Requires an Official Transcript?
One official transcript is required from each U.S., U.S. Territorial, or Canadian postsecondary institution at which you have attempted coursework, regardless of whether you earned credit. The transcript requirement applies but is not limited to:
• College-level courses attempted while in high school, even if the courses did not count toward a degree at any college
• Colleges at which you originally attempted a course, even if the credit was subsequently transferred to and accepted by another school
• Colleges where you registered but did not earn any credit (e.g., incompletes, withdrawals, failures, audits)
• Courses that did not count toward a degree, regardless of whether credit was earned or transferred
• Extension programs through which you attempted courses, if a separate transcript is provided by the extension division
• Correspondence and home study programs
• Military education
• American colleges overseas
• U.S., U.S. Territorial, and Canadian medical schools
They count towards college GPA if the credits are accepted. My credits are both for high school GPA and college GPA because of them being transferred. Had they not been transferred it would only be under high school GPA. You are also allowed to exempt these classes from college GPA and practically start over since it was in high school that the classes were taken.
See section in bold above. Your GPA for classes taken before HS graduation will be a separate GPA from college GPA on the AMCAS application. This is why the GPA on your transcript is often different than the GPA calculated by AMCAS.