Hello Aspirant,
You have to fill the category to which you belong if you belong to a general category you must fill general category in the form and if you belong to OBC category then you must fill OBC category in the form. There is no such option in the form to fill both the categories and whatever category you will be feeling you will be treated under that.
For further information regarding AISSEE examination you can refer the following link:
https://school.careers360.com/exams/aissee
All the best!
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