These are specially added for Institutes located in India which requires some additional information like student's caste and category. However religion and blood groups are commonly used in institutes located in various part and you can also use it as per your requirement.
Castes are classes of Hindu society, distinguished by relative degrees of ritual purity or pollution and of social status such as Kshatriya, Bramhan, Vaishya etc.
Categories are system of reservation in India comprises a series of measures, such as reserving access to seats in the various legislatures, to government jobs, and to enrollment in higher educational institutions such as Schedule Castes (SC), Scheduled Tribe (ST), Other Backward Classes (OBC) & General (GEN).
You are free to use or not to use any of above configurations as per your need.