Appropriate sentence/ Tense to be used for declaring something

Which sentence should I use when I pass the exam? I mean at the time of announcing the result.

a) I cleared the Exam. (Past Tense)

It refers to the past event of passing the exam. I mean results were declared first and then I am announcing to my family.

b) I clear the Exam (Present Tense)

It refers to the current status of passing the exam.

c ) I have cleared the Exam (Present Perfect Tense)

I think this is the correct sentence to be used because it is referring to a past event having an impact on the present.

You could use simple past or past perfect, either works. There's no particular reason to prefer one over the other. This is often the case in English.

However, the verb "clear" wouldn't be usual here, at least in British English.