-1' OR 3*2<5 or 'RLFgWRKv'='

It looks like an incomplete SQL injection payload. Here’s a quick breakdown and why it’s not a solid query by itself:

• -1' : This tries to close a previous string literal in SQL. If your application concatenates user input into a string inside a query, this could end the string early.
• OR 32<5 : This introduces a boolean condition. 32 is 6, so 6<5 is false.
• or 'RLFgWRKv'=' : This starts a comparison between a string literal and something else, but it’s incomplete (the right-hand side is missing), so it would cause a syntax error.

In a real vulnerable query (for example, something like ... WHERE user = '\(input' AND pass = '\)pass'), a properly formed injection might try to inject something like ' OR 1=1 -- to make the WHERE clause always true. But the given string is not a complete, valid payload.

Key exam-relevant points about this kind of content:

• It demonstrates the idea of breaking out of a string literal and inserting boolean expressions into a query.
• The specific payload as written is incomplete and would usually cause a syntax error rather than reliably bypass authentication.

Defenses you should know for exams:

• Use parameterized (prepared) statements instead of string-concatenated queries. E.g., in many languages, query like: SELECT * FROM users WHERE username = ? AND password = ? with parameters bound separately.
• Validate and sanitize inputs, and avoid constructing dynamic SQL from user input.
• Apply least-privilege database accounts (e.g., app user with only necessary SELECT/INSERT rights).
• Use proper error handling so you don’t leak database error details to users.
• Consider a Web Application Firewall (WAF) and security headers, along with regular security testing.

If you want, tell me the language/framework you’re studying (SQL dialect, PHP, Python, Java, etc.), and I can show a safe, concrete example of how to defend against SQL injection in that context. Or I can give you a few practice questions on injectability and prevention.