
    Design a function that analyzes a sequence of student assessment scores and calculates the sum of passing scores (even numbers) that occur at checkpoint intervals (even positions) to determine overall readiness for advancement. The function should only consider scores at even-numbered positions (0-based indexing) and add up those that are even numbers, helping identify if the student has demonstrated consistent mastery at key evaluation points.
    

    
def sum_even_and_even_index(arr):
    """
    Design a function that analyzes a sequence of student assessment scores and calculates the sum of passing scores (even numbers) that occur at checkpoint intervals (even positions) to determine overall readiness for advancement. The function should only consider scores at even-numbered positions (0-based indexing) and add up those that are even numbers, helping identify if the student has demonstrated consistent mastery at key evaluation points.
    

    """
def sum_even_and_even_index(arr):
    """
    Design a function that analyzes a sequence of student assessment scores and calculates the sum of passing scores (even numbers) that occur at checkpoint intervals (even positions) to determine overall readiness for advancement. The function should only consider scores at even-numbered positions (0-based indexing) and add up those that are even numbers, helping identify if the student has demonstrated consistent mastery at key evaluation points.
    

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