Not very reliable. The main reason here is that the reference data are some years in front of the college entrance examination data, can only say that the situation in front of the occurrence of the situation to anticipate the situation may occur this year, can only be used as a reference, and a lot of the so-called "big data", the data is not necessarily much more than accurate it. The year's data a belong to the privacy of the students, the second with the college entrance examination paper belongs to the top secret, the third is a lot of candidates like you have not filled it, so in the end of the admission is impossible to know the accurate situation of the year. Just like buying a lottery ticket, only the draw to accurately know that you hit or not, before the draw, no matter how much research, are not very reliable, to be reliable, those who study the people have long been billionaires, rich can rival the country.