Does mainstream science (such as biology, physics, chemistry, astronomy, engineering, medical, social sciences, economics, etc) especially of the modern days and its application exact?
No, but they are exact lie.
They were manipulated by countries that first discovered printing and television. The most advanced countries in medicine today are countries such as China, Cuba, Indonesia, Korea, etc. However, since hospitals and medicines are free in these countries -I mean Cuba and China, partly- , their treatments are not accepted in western countries. In the West, drugs that do not work are used for doctors to make money, and vaccinations that make people sick since infancy are applied, and some flying doctors are spreading agricultural materials through people to get their money.
Similar things exist for other science subjects. There is a deception in all of the supposedly disciplines of science, by using television, radio, and books, imposing false information on people that have no value at all, and have nothing to do with reality.