Hawk High

Issue Description

The graduateAndUpgrade function fails to implement a critical business logic requirement: preventing students who haven't met the minimum score threshold from graduating. While the contract initializes and tracks a cutOffScore in the startSession function, this value is never actually used to validate student eligibility during the graduation process.

Impact

High Severity. The absence of this validation completely bypasses a core academic requirement of the system. All students will be promoted to the next level regardless of their performance, which:

• Undermines the entire academic assessment system

• Invalidates the purpose of tracking student scores

• Defeats the purpose of the teacher review mechanism

• Contradicts the explicitly stated graduation requirements

Detailed Analysis

In the current implementation:

1. The cutOffScore is set in startSession:

   function startSession(uint256 _cutOffScore) public onlyPrincipal notYetInSession {

   sessionEnd = block.timestamp + 4 weeks;

   inSession = true;

   cutOffScore = _cutOffScore;

   // ...

   }

2. Teachers can give reviews that affect student scores via giveReview:

   function giveReview(address _student, bool review) public onlyTeacher {

   // ...

   if (!review) {

   studentScore[_student] -= 10;

   }

   // ...

   }

3. However, the graduateAndUpgrade function processes graduation for all students without checking their scores:

   function graduateAndUpgrade(address _levelTwo, bytes memory) public onlyPrincipal {

   // No validation against cutOffScore

   // ...

   }

This completely negates the stated requirement: "If they fail to meet the cutoff score at the end of a school session, they will be not graduated to the next level when the Principal upgrades the system."

Recommendation

Implement the missing validation in the graduateAndUpgrade function:

Alternatively, if students who don't meet the criteria should be expelled rather than blocking the upgrade: