Asuccessful study session starts off with

a. reviewing information from the last meeting.
b. asking questions and discussion notes.
c. drilling one another on topics and concepts.
d. brainstorming potential test questions.

a. reviewing information from the last meeting.

Explanation:

A study session is  an academic retention program where students or participants meet at regular interval to discuss on a topic or a academic syllabus. A study session will be successful if members or the participants review the information or the previous notes from the last or the previous meetings.

Hence the correct option is (a)

answer; procedural justice;

answer; all of the above are correct;