A couple of important thing that helped me:
- Treat both statements (call it S1 and S2) SEPERATLY. Its very common mistake to carry over information from S1 to S2 or other way around.
- As most of the guides suggest, use POE(process of elimination). AD/BCE. Practice it till you become master in this.
- Pay close attention to details like Integet/Non-zero/Odd prime/Digit/Non-negative etc.
Personally I found it helpful to try S2 first.
Whether you think you can or think you can't. You're right! - Henry Ford (1863 - 1947)