Contract Law - Wahi Question Yaar...

Main ek baar phir se sawal ka saamna kar raha hoon, jab tum log mock tests dete ho, I'm at my shift. Exam 3 din mein, aur main yeh ek baat samajh nahi paya jiska mujhe kharaab lag raha hai. Agreement ka ek type hai, jismein ek condition hai ki contract kabhi bhi break ho sakta hai, tab bhi jab wo khatam ho gaya hai. Lekin main yeh samajh nahi paya ki kya yeh ek express condition hai ya implied?

Kya agar ek condition hai ki contract jab tak 3 mahine ka aayu pura karti hai, tabhi yeh effective rahata hai, toh kya yeh break clause hai ya not?