if i want to go to china to study Chinese and take the HSK exam, will i be given a visa? and on what condition will i be given the visa?

It depends on the visa officers if you are qualified to get a China visa. First, you need to get an Enrollment Letter from the Chinese school, Foreign Student Visa Application Form (JW201 or JW202) issued by the Chinese authorized unit, and the Admission Notice from the Chinese school. These are the deemed necessary documents to apply for a China student visa.