Many advisors will tell you that do not attempt the questions when you dont know the answer because there is negative marking.
Are they correct?
Probability theory says they are wrong in advising you so.
Follow the tips here and score even when you dont know the answer.
For any help with preparation of CPT exam, use Prof Ved's Video lectures. Thousands of successful students will strongly recommend you these video classes.
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Or simply give a missed call at 9980100288 for any help.