Question

we shall have examinations ____ August. use prepositions.​

Answer 1

Before indicates in front of or earlier than someone/something. Before is the required answer as the activity of reviewing is done before the examination. Thus option A is the correct answer.
Since refers to a past point of time; With is used to indicate means, possession, contents, relationship, for and against;To is used to indicate direction, purpose, limit, attachment, comparing. Since none of these prepositions fulfill the meaning of the sentence,options B,C,D are incorrect.

Answer 2

Answer:

We shall have examinations in August.

Explanation:

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