Civil cases

U can't really do anything. The judge reserves the right to pass the judgement as per his discretion. N he can die or retire also without passing the judgement. Usually in big criminal cases, the judge divides his judgement in 2 parts which will be declared on different days, in the 1st one ,he will pronounce if the person is guilty or not and in the 2nd part, he will give the punishment if the accused is found guilty. 

But if the judge is being arbitrary and unnecessary dragging the case, then u can file a writ petition in a higher court stating the same.

In Anil Rai vs State of Bihar case Supreme Court stated that parties can file an application in the high court seeking an early judgement if it’s not delivered within three months of it being reserved.