Java: Lan Based System Randomizing Values

I am going to create a Lan based examination system, whenever I am going to access the systemin different PC's uhm.. let say for ex. in PC1, PC2 ,PC3 those PC's should be answering different type of examinations. Given example like in the PC1 - English, PC2 - Math, PC3- Science? How can I randomize or make the value differ from one another if its a Lan based java system?

Any suggestions?