
    Create a function that standardizes student performance data by converting all numeric-like values in nested lists of assessment metrics to decimal numbers, where each inner list contains various student performance indicators such as attendance rates, test scores, and participation levels. The function should handle multiple assessment periods and measurement categories while maintaining the original data structure, converting only those values that can be legitimately represented as decimal numbers.
    

    
def list_to_float(test_list):
    """
    Create a function that standardizes student performance data by converting all numeric-like values in nested lists of assessment metrics to decimal numbers, where each inner list contains various student performance indicators such as attendance rates, test scores, and participation levels. The function should handle multiple assessment periods and measurement categories while maintaining the original data structure, converting only those values that can be legitimately represented as decimal numbers.
    

    """
def list_to_float(test_list):
    """
    Create a function that standardizes student performance data by converting all numeric-like values in nested lists of assessment metrics to decimal numbers, where each inner list contains various student performance indicators such as attendance rates, test scores, and participation levels. The function should handle multiple assessment periods and measurement categories while maintaining the original data structure, converting only those values that can be legitimately represented as decimal numbers.
    

    """
    res = []
    for tup in test_list:
        temp = []
        for ele in tup:
            if ele.isalpha():
                temp.append(ele)
            else:
                temp.append(float(ele))
        res.append((temp[0], temp[1]))
    return res