The number of students admitted to Zhenping High School for the entrance exam will likely be around 500-600. This estimate is based on historical admission data, which shows that the school typically admits a similar number of students each year. Zhenping High School has a reputation for academic excellence and attracts a high number of qualified applicants, leading to a competitive admissions process. The school's capacity and the number of applicants in previous years have consistently resulted in this range of admissions.