About CIMA

I went through the Site of Cima but found it confusing . I have done my graduation in B.Com.ie Bachelor of Commerce and am currently in final CA ie i have passed integrated professional competence course of ICAI.I Have the following Querries:-

1 To become a Cima; how long does it take? ie Is it that all  papers of all three levels can be given at once or only after completion of one level the candidate is eligible for the next level.
2 What are the exemptions i would get due to my above qualification. Is the exemption in all 3 levels or for the first level ?
3 How much is the fees per exam or the total fees for the course.
I would be glad if my above querries are answered