CBSE maths marking me he ye, exactly matlab kya he?

https://preview.redd.it/lo3hi8smc7og1.png?width=1134&format=png&auto=webp&s=61572825222aa41655b25849b7fc4f9235444353

So agar mene question ke first step me galti ki, to fir bas us step ke marks katenge aur baki steps sahi kiya to unke marks milenge kya?
Aur ese to fir me koi bhi hard question ko easy kar sakta hu first step me change karke, fir mujhe baki steps ke mark mil jaayenge