What is Exam & Zachot ?

The subject which lasts for 1 or more years has an exam. And the subject which lasts for 3 months or 6 months is Zachot .

What is the difference between exam and Zachot ?

You get 3 chances to pass the exam. Where as in Zachot it can happen more than 3 times. Zachot can be in the form of Mcqs or Written or Both. While the exam consists of Mcqs, Theory (written) and oral form.