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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You should find a place to pray that is secluded, and mustn’t pray in public unless as a necessity. In this case, you can keep your face covered and you can pray on any ground whether clean or dirty as long as there is no najasah or impurity that prevents prayer.

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