In the sentence: بساعدوا بعض بالواجبات، و بدرسوا مع بعض Why is there مع after the verb they study but not after they help?

In the sentence:
بساعدوا بعض بالواجبات، و بدرسوا مع بعض
Why is there مع after the verb they study but not after they help?

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