Scorecard.sol

//SPDX-License-Identifier: GPL- 3.0
pragma solidity >=0.7.0 <0.9.0;

contract Scorecard {
    uint256 studentCount = 0;
    address public classTeacher;

    constructor() {
        classTeacher=msg.sender;
    }

    modifier onlyClassTeacher(address _classTeacher){
        require(classTeacher == _classTeacher,"Only Class Teacher has access to these actions");
        _;
    }

    struct StudentDetails{
        string studentFirstName;
        string studentLastName;
        uint256 id;
    }

    struct Score{
        uint256 studentId;
        uint256 englishMarks;
        uint256 mathsMarks;
        uint256 scienceMarks;
    }

    mapping(uint => StudentDetails) students;
    mapping(uint => Score) scores;
    event studentAdded(string  _studentFirstName,string _studentLastName,uint256 _studentId);
    event studentScoresRecorded(uint256 _studentId,uint256 _englishMarks,uint256 _mathsMarks,uint256 _scienceMarks);

    function addStudentDetails(string memory _studentFirstName,string memory _studentLastName) public onlyClassTeacher(msg.sender){
        StudentDetails storage studentObj = students[studentCount];
        studentObj.studentFirstName = _studentFirstName;
        studentObj.studentLastName = _studentLastName;
        studentObj.id=studentCount;
        emit studentAdded(_studentFirstName,_studentLastName,studentCount);
        studentCount++;
    }

    function addStudentScores(uint256 _studentId,uint256 _englishMarks,uint256 _mathsMarks,uint256 _scienceMarks) public onlyClassTeacher(msg.sender){
        Score storage scoreObject = scores[_studentId];
        scoreObject.englishMarks=_englishMarks;
        scoreObject.mathsMarks=_mathsMarks;
        scoreObject.scienceMarks=_scienceMarks;
        scoreObject.studentId=_studentId;
        emit studentScoresRecorded(_studentId,_englishMarks,_mathsMarks,_scienceMarks);
    }
}