Last month, North Korea's National Defense Commission said the United States was its prime target for a nuclear test and long-range rocket launches.

NPR: Obama Calls NKorea Nuke Test 'Highly Provocative'

Perik's target profit margin is the same for the assessment business as for test prep, 20% after tax. (Test prep accounts for 70% of the company's revenues, K--12 the rest.) His risky strategy: Instead of emphasizing customized assessment tests for particular school districts, he plans to deliver a more generic product.

FORBES: Boost Your Score

He reached the target in his 118th Test with a drive off Ramnaresh Sarwan, but was dismissed soon afterwards for 65.

BBC: Ponting passes Test run milestone