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Laboratory and Theory exams are conducted separately in Engineering. If you pass in the Laboratory examination in a particular by scoring the minimum passing marks but failed in the theory examination of  the same subject in semester end examination then you need to again appear for theory examination only and score the minimum passing marks or above to pass in that subject. You do not have to appear for laboratory examination again. Supplementary examinations will be conducted in the subsequent semester. You need to pay the supplementary fee to again appear for the theory examination.