คุณจะได้เกรด A และเกรดจะลดลงไปตามคะ

คุณจะได้เกรด A และเกรดจะลดลงไปตามคะแนนของคุณ และคุณต้องได้คะแนนไม่น้อยกว่า 50 คะแนน คุณจึงจะสอบผ่านวิชาของผม

Results (English) 1:

You'll get a grade A and grade will be reduced based on your score, and you have to be able to score at least 50 points, you will pass my subjects.

Results (English) 2:

You will receive a grade A and grade will be reduced according to your score. And you have to score at least 50 points, you will pass my course.

Results (English) 3:

You will have A grade and grade will decrease with your score. And you have to score at least 50 points. You will pass my course