Use these: (A) The students are boarding the school bus. (b) They are queuing (up) to board the bus. (c) The pupils like to board the school bus.
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Vincent TeoCan I say,(A) The students are boarding (up) the school bus. The "up" would not be used. "Boarding up" is what you do to an abandoned house after a hurricane has broken out all the windows.
(b) They are queuing (up) to board(up)the bus. Same as (A)