Score range for GRE is 260-340 (Including verbal and Quant).
Here is the categorization of the scores. If you are targeting TOP 20 universities you have to get 300+ for engineering major. Any score above 300 + will get you admission from a Decent university.
|GRE Score Range||About GRE Score||Universities you can target|
|315-330||Good||Grade A-, Grade A|
|295-315||Average||Grade B+, Grade B, Grade B-|
|280-295||Below Average||Grade C|
|<280||Retake GRE||Grade D|
Any score below 280 is not Good. It is better to retake GRE or you will end with admissions from low ranked universities.