How Many times CDS exam conducted in a year

Hello sir, I am Porav Maheshwari. I want to know that how many times CDS exam is conducted in a year. Can you tell me about its eligivility details and exam pattern?

[Kiran Chandar]

Combined Defence Services Examination (CDS) is conducted twice a year by the Union Public Service Commission (UPSC) for recruitment into the Indian Military Academy, officers Training Academy, Indian Naval Academy and Indian Air Force Academy.
Eligibility Details:
Age Limit:

Indian Military Academy 19-24 years
Air Force Academy 19-23 years
Naval Academy 19-22 years
Officers’ Training Academy 19-25 years

Educational Qualifications:
IMA & OTA Degree of a recognized University or equivalent
Naval Academy B.Sc. with Physics & Mathematics or Bachelor of Engg
Air Force Academy B.Sc. with Physics and/or Mathematics or Bachelor of Engg

Exam Pattern:

Subject Marks
English 100
General Knowledge 100
Elementary Mathematics 100
Total 300

Marks for SSB Interviews
IMA, NA and AFA 300 marks
OTA 200 Marks