Explanation:

Correct Answer is (d).According to the given sentence, it means that one will be waiting for another till the time the other is done with his class in the college.
In such sentence where there are two actions denoting two different points of time, we use the future indefinite tense for the action that will finish later whereas for the other action, the simple present tense is used in the sentence. Here, in the first part of the sentence, shall wait is correct but in the second part of the sentence will finish is not correct since here the simple present tense should have been used. The correct usage would have been finish with your class. 
The correct sentence would be: I shall wait for you till you finish with your class in the college.It makes option D the correct choice among the given options.