how can i create a dictionary of dictionaries from a file

[DeaD_EyE]

What is your input data?
Json-Data looks like your example.

For example, this is csv:

surname,name,gender,growth
Musk,Elon,m,183
Holmes,Enola,f,175
Brown,Lilly,f,178
Lothbrok,Ragnar,m,189
Smith,Adreana,f,173
Moon,Larry,m,184

Example to open the csv file:

import csv

rows = []
with open("your_file.csv", encoding="utf8", newline="") as fd:
    for row in csv.DictReader(fd):
        print(row)
        rows.append(row) # adding the dict to rows

Keep in mind that everything from csv-reader is a str.
All decimals and integers are str objects. To use them for sorting or to make calculations with them,
you need to cast the str to int or float.

import csv

rows = []
with open("your_file.csv", encoding="utf8", newline="") as fd:
    for row in csv.DictReader(fd):
        row["growth"] = int(row["growth"]) # str -> int
        print(row)
        rows.append(row) # adding the dict to rows

The other question is: From where are the student numbers (which are also str in your example)?