Is the following sentence correct?
The requirement is only five passed subjects, therefore, I believe, there is no need to attach certificate no.001. The rest is up you.
options to Anonomous' infinitive:

that you pass

you must pass

Also: Since only five subjects must be passed, I believe there is no need to attach "certificate no. 001." The rest is up to you.
Not REAL sure what you mean, but I will try:

The requirement (for XXX) is to pass at least five subjects. Therefore, there is no need to attach ''certificate no.001.'' But that is optional.
 Avangi's reply was promoted to an answer.