How exactly are you guys comparing set-1,2,3 when there are multiple question paper series all over India?

Yahan kafi posts dekhi, jahan log bolre hain ki bhai set-3 sabse hard tha. Bhai pr series to 5 se bhi zyada distribute hui hain all over India. Jahan tk mujhe pta hai 55/5/3 aur 55/6/3 alag paper hain. Ya to mai confuse ho rakha hun. 55/5/3 me 5 series number hai aur 3 set number hai. To agar tum compare karre ho to series to mention karo.