To achieve a good rank in CSE and ECE your rank should be above 10000.
It depends on your category, state quota and other factors affecting reservation also.
You can check in detail about the reservation and cut off thereby in the link below.
This is the cut off of last year's. It may vary due to various reasons such as students response to colleges, number of candidates appeared, etc.
Computer Science and Engineering - 6940 for open quota and 16547 for state quota.
Electronics and Communication Engineering - 5696 open quota and 19408 for state quota.