How much do internal marks matter in US highly selective college admissions?

In the British Schooling system, students study for GCSEs and then A-Levels. After 2 years of GCSEs, standardized worldwide exams are taken that determine the student’s final grade for approximately 2 years of taking the same 10 courses. In addition to the final grade from the GCSE exams, students also receive term marks from their teachers. These are often the teacher’s predictions as to what the student would achieve on the GCSE exam at the time of the report, and are largely irrelevant in UK university admissions. Having switched from this system to the US system, I have several questions. ANY help would be much appreciated.

I completed GCSEs, and achieved all A/A*s on the final exams. However, my term marks from the teachers are absolutely littered with Bs and even Cs. Will selective American colleges look down upon these grades despite the good final exam results?

The grading scale is A* A B C D E F G U… does a B in this system mean the same as a B in the American grading scale?
If these grades were received 3-4 years before applying to college, and I have since gotten good grades in the American system, will these grades carry less weight?

Do you think I could submit my GCSE results only and not my term marks, along with my US high school transcript?

If the british grades were 3 to 4 years ago and you are still in high school, why would colleges even see them?

You need to ask each college and university that you apply to how they want you to handle this. Send whatever college A wants to college A, and whatever college B wants to college B. There is no easy way to predict this.

American colleges do not care what the internal, intermediate teacher reports are. They do care about your GCSE grades.
A British B is typically interpreted as an A- (as that’s what it stands for on the scale), and E= C. Some colleges factor the British B as equivalent to a 3.5, so, in between A- and B+ but British E= American C is pretty fixed.