If every organization requires experience to select a candidate, where actually candidates will get experience ?

I believe you can have as much book knowledge and spend time at universities, but the actual training start at ground level,  to work and to learn the trade, then only you can decide if tis is what you want. 

for you as employer to take your candidate to the expertise , training and develop them to know they can build your company on behave of you  , skill them to perfection   If you are trained by your company you develop skills to build the new managers

Usually a candidate may get an experience for the said position if the company he/she worked to provides proper training that will enhance their skills. Also, experience is acquired if his/her immediate superior gives them proper guidance, motivation, assigning job projects (encouraging sense of ownership). Multi-tasking may be also consider as one factor why a candidate is exposed to different type of job/work that are beyond his/her scope of work which makes them more flexible and innovative.

one of the requirements of almost all the jobs is some year's experience at similar position. How a candidate will get experience if he is not employed to one of the positions because of not having experience of working at similar position ?that was actually my question but till now I got two confusing answers which are not even related to the question