Siddharth Iyer spent eight Mays cramming for finals, first at Stuyvesant High School and then at Columbia University. Nine years later, it is still crunch time for Mr. Iyer, a top tutor at Ivy Consulting Group, as his clients face a deluge of end-of-year exams, reports the New York Times. “He’s been prepping my son all week,” said the mother of one, a senior at Riverdale Country School in the Bronx, speaking on the condition that she not be named because Riverdale discourages both tutoring and talking to reporters…