Expectations are always for the future, not for the present or the past. Therefore it is safe to say that they are based on our beliefs. Beliefs on the other hand are to a large extent based on past experiences.
If a student is fairly average in science and you ask him if he expects to crack the IIT, his verbal response may be a ‘no’. But if you ask him if he would try for the IIT, he probably would say a ‘yes’.
To have expectations is good, healthy and positive. All expectations may not come true but it is something to try for. It helps one to set a target, encourage hard work, develops strategic thinking. All of which is positive behavior towards developing a growth mindset. Expectations raised on the rock of sustained efforts withstand high speed winds.