
    Create a function that calculates the total score of successfully completed milestone evaluations in a student's learning path by summing only the passing scores (even numbers) from key assessment checkpoints (even-positioned scores). The milestone evaluations are critical checkpoints positioned at even intervals throughout the learning modules, and only even-numbered scores indicate successful completion of these checkpoints.
    

    
def sum_even_and_even_index(arr):
    """
    Create a function that calculates the total score of successfully completed milestone evaluations in a student's learning path by summing only the passing scores (even numbers) from key assessment checkpoints (even-positioned scores). The milestone evaluations are critical checkpoints positioned at even intervals throughout the learning modules, and only even-numbered scores indicate successful completion of these checkpoints.
    

    """
def sum_even_and_even_index(arr):
    """
    Create a function that calculates the total score of successfully completed milestone evaluations in a student's learning path by summing only the passing scores (even numbers) from key assessment checkpoints (even-positioned scores). The milestone evaluations are critical checkpoints positioned at even intervals throughout the learning modules, and only even-numbered scores indicate successful completion of these checkpoints.
    

    """
    i = 0
    sum = 0
    for i in range(0, len(arr), 2):
        if arr[i] % 2 == 0:
            sum += arr[i]
    return sum