Go to the cusat website and login using your details. Then click on the link to the answer key. There you can see all the questions that u had for the exam. The answers u marked for the exam is shown as a dot beside the options, and the correct option is shown in green. By checking all the questions u can find how many questions u got right and wrong. Add 3 marks for every right answer and reduce 1 for each wrong one..... This is how u can calculate your score

Thank you for taking ur time to help me. But that predictor asks for the rank obtained, which is yet not known...