You should pray maghrib on time, it is not acceptable to delay it past its time everyday for this reason. I didn’t understand your justification. Never the less, you can go out to answer the call of nature for few minute. You can Pray outside the class room.

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There isn’t any prescribed Surah except reading 3 times the last 3 surah of the Quran + ayatul kursi once in the morning and in the evening. Reciting them all once after every mandatory prayers.

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Whatever is best for him and that which would not splash urine back on him.

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