Help please with task on c++

I do not know how to write this program, but to take it tomorrow, please help. Here is the condition: Make a list containing information about N students. For each student, specify the surname, date of birth, grades of the session in three subjects. Formalize information about each student in the form of a structure. Combine the set of structures into an array. Keep information about students in a file. Create a program that provides input of source data, sorting, processing and display of information in accordance with the requirements: Sort students by grade in the first subject. Display the last name of the youngest student in the group. N = 7.

We’re not in the habit of doing someone’s homework for them, but are willing to help if you make the effort and get stuck. What have you gotten so far.