HI, After you get a back in one subject you will get a option to re appear for the exam which is basically compartment.

The guideline states: A candidate failing in one of the five subjects of external examination shall be placed in compartment in that subject provided he/she qualifies in all the subjects of internal assessment.

• A candidate placed in Compartment Examination may reappear at the compartmental examination to be held in July the same year, may avail herself of second chance in March/April and third chance in July of next year. The candidate will be declared PASS provided he/she qualifies the compartmental subjects in which she had failed. Syllabi and Courses shall be the same as applicable for the candidates of full subjects appearing at the examination in the year concerned.
• A candidate placed in compartment shall be allowed to appear at the subsequent three chances of Compartment only in those subjects in which he/she has been placed in compartment.

These are the important criteria/s

In case you want to know more, let me know.

All the best!