MYTH ABOUT CUT OFF !!!!!

There are a lot of queries in all public forums about the "Expected cut-off"
For instance let us take RBI GRADE B OFFICER RECRUITMENT EXAMINATION.

 Last year the round 1 cut-off was 126 for general.
After the exam, aspirants were like.... "General awareness dead easy...... 

cut offs said to go HIGH".

 But you know what happened?
General cut off was 104. So as a matter of fact, there is no pre-determined cut 

off. It is based on the vacancies available and the performance of the aspirants.
So what happened in RBI Grade B? Yep. Questions were kinda easy, but aspirants 

found it difficult. 
So cut off obviously came low. Let's imagine a situation. We have 100 vacancies 

for a job. 500 people write exam and the exam is out of 100 marks.The company 

announces
40 as pass mark (cut off).
Problems with this approach.
Case 1. Nobody got above 40 -------> recruitment plan ruined
Case 2. Most people got above 40, making it tedious for the employer

to conduct interview. Incurs cost and time.

SO HOW IS CUT-OFF CALCULATED?? (A brief idea based on my understanding. 

May not be correct)

So SBI wants 1500 POs. 17+ lakh people right it. So SBI thinks this way..... 

I can't shortlist the top 1500 people and recruit them directly
and give them all sorts of allowances and enrich their life :P 
WHY?????? People having good written exam skills may lack public speaking skills

 and other interpersonal, communication skills necessary for a bank job.
At the same time, SBI says i dont want to shortlist top 20,000 and interview 

them all....... man its gonna take more than six months for me to finish 

the process. So bank draws up a line here. I do not care how much the aspirants 

score. But i want to shortlist top 3000 and select the aspirants on a 1:2 

ratio basis.

So basically cut off is going to be based on this ratio set by the bank.
Forget about reservations. i do not want to discuss about it, but at the end 

of the discussion you will be able to understand how the whole process works 

when reservations are considered.SBI conducts exam for 250 marks. Marks of 

aspirants is purely based on their knowledge and difficulty of the paper.
Irrespective of the scores obtained, SBI wants to shortlist top 3000 for 

the interview process.So the 3000th person's score will be the cut off. 

Obviously the top 2999's score will be more than the 3000th person's score.
This is how cut off is obtained. (Overall cut off)Sectional cut offs are 

calculated based on the average performance of the aspirants in each section 

and the bank's requirement. (SBI says i want a future employee of mine to score 

at least 13/50 in english.If not i consider him to be too poor in communicating

 with customers even if he scores 50/50 in all other sections)
This is how sectional cut off is calculated.
Now pull in reservation concept into this.
Imagine advertisement reads SBI gives 450 seats to general category people. 

So at the end of round 1. SBI would pick 450*2=900 seats for interview process. 
Why?? They are following the 1:2 ratio thingy.

So ideally you can judge the cut off based on history.
Inspect the bank's ratio thingy and the previous cut offs may give you a brief 

idea about the difficulty of the question paper

Happy to help :) :)