what will happen now if i bubble all the options?

Shaheen, the servers will pick up the correctly circled answers. Lets say you appeared for an entrance examination which has 180 MCQs and each MCQ has 4 options. And you circled all the 4 bubbles. The server will pick up the Correct answer. Because you circled 720 bubbles, you get 180 correct answers. Now, when the paper is brought for manual investigation, the truth comes out as how you scored all correct and your application will stand cancelled, your result will be declared null and you will be held in contempt. In short, you ruin your career.