Contract Law Mock Test - AILET PG

I just gave a mock test for AILET PG and I'm still reeling from the Contract Law section! I scored 6/10, which isn't bad, but I'm worried about those 4 questions I got wrong. I struggled with Section 27 - Restraint of Trade and Section 75 - Effect of Failure to Perform. I keep getting confused between 'void' and 'voidable' agreements. My friend, who's a senior, told me to focus on illustrations and case laws, but honestly, I find them hard to remember. I'm planning to revise the Indian Contract Act, 1872, again and practice more questions. Has anyone else struggled with these topics? Any tips would be super helpful!