Evidence Act ke liye Khatra! Still Confused with Residual Act

Main khadi ho gayi hoon, exam ke 3 din bache hain aur abhi bhi Evidence Act ke ek cheez ke baare mein pata nahi lag raha hai. Ye Residual Act ka concept hai. To kya hai yeh? Kya yeh keht hai ki jo evidence admissible nahi hai, woh bas koi residual evidence act ho sakti hai, jisse woh admissible ho jayegi? Lekin kya yeh evidence act ka application hoga yaa koi aur cheez? Abhi tak nahi samajh raha hoon kya karna hai. Kya kuch experts keh sakte hain? Ye sab too much hai aur exam ke 3 din bache hain. Please help!