-1' OR 3*2>5 --

Looks like a classic SQL injection payload.

What it does (high level):

• -1' tries to break out of a string literal in a SQL query.
• OR 3*2>5 inserts a condition that is true (since 6 > 5).
• -- starts a SQL comment, so the rest of the query is ignored.

Net effect: If inserted into a vulnerable query, the WHERE clause can become something like: ... WHERE ... = '-1' OR 6>5 -- which is effectively always true and can bypass filters or authentication.

Exam notes:

• This is an example of boolean-based (tautology) SQL injection plus comment-based termination.
• It relies on string concatenation to build SQL without proper binding.

Defenses (in brief):

• Use parameterized queries / prepared statements (bind variables) everywhere.
• Validate and type-check inputs (e.g., ensure IDs are integers).
• Avoid building SQL with string concatenation; use ORMs or proper APIs.
• Apply least-privilege database accounts.
• Consider input whitelisting and server-side checks.

If you want, I can show example mitigations in common languages (Python, Java, PHP) or give more practice payloads and their defenses.