The correct answer is: Only assumption I is implicit.
The statement “Those who are appearing for this examination for the first time should be helped in filling up the form” implies that the form is somewhat complicated. This is because if the form was not complicated, then there would be no need to help people who are appearing for the examination for the first time.
The statement does not imply that candidates can appear more than once for this examination. This is because the statement only says that those who are appearing for the examination for the first time should be helped in filling up the form. It does not say anything about those who are appearing for the examination for the second time or more.
Therefore, only assumption I is implicit.