Useful. According to the introduction of the notes of the top students in Hengshui Key Middle School, the notes compiled by the top students in Hengshui are substantial and have a good effect of supplementing the foundation. The knowledge points of mathematics and physics are comprehensive and clear at a glance. Hengshui is a prefecture-level city under the jurisdiction of Hebei Province, located in the southeast of Hebei Province, bordering Cangzhou and Dezhou in Shandong Province in the east, Shijiazhuang in the west, Xingtai in the south and Baoding and Cangzhou in the north, with a total area of 8,836 square kilometers.