Noriko Mori, 47, paid about ?700,000 ($6,300) to a cram school to help her daughter prepare for a school entrance exam in Tokyo. Her daughter was six, and the entrance exam was for an elementary school.

¡°It was expensive,¡± Mori said. But ¡°she passed the test for the school she wanted, so it was a choice well made.¡±

The cram school in question was Riso Kyoiku Co., which provides private lessons to children of all ages whose parents can afford to pay. Goldman Sachs Group Inc. thinks it¡¯s a winning strategy, and has initiated coverage on the stock.