Hello buddy, thanks for connecting with career360. We hope we will solve your query in the best way.                                                            

The cutoff for GNDU is very less you can easily get CSE at GNDU if you have rank less than 1.25 Lakh . You will get ECE if you have rank less than 2.5lakh or you can also get ECE at 3 lakh in waiting list. Cutoff vary every year it may increase or decrease so don't believe on it completely. You can also get admission on the basis of your board marks. 

You should also fill UIET,  Chandigarh form if you have rank less than 1 Lakh.            

Best of luck for your future buddy!        

Bes