Cheat the people upstairs, how can you count to three The number three is the economy, and the agricultural test is the number two. Only advanced mathematics and modernity are tested, not probability. Moreover, the differential equation in number two is not tested, and some parts of line generation are not tested. Although the number two is the simplest in theory, there is a lot of content in the high number part because the probability is not tested. The landlord must learn the high number part well!