Yes, you can file an RTI to Pandit Deendayal Upadhyaya Shekhawati University as it is a state university. You can file an application along with all the all details i.e. name, registration number, course name, university name along with a admit card copy.
For further assistance in filing RTI application for copy of answer sheet please refer File RTI Online to get Copies of Answer Sheets in Simple Steps