The OBC NCL category certificate is not given on the basis of the individual capacity.
It is always based on the status of the parents for this.
1. If your father’s and mother’s combine income is less than 8 lakh PA ?
If your annual family (Definition of family-father, mother & minor children below 18 years) income (excluding government salary and agricultural income) is more that Rs. 4.50 lakhs in all the last three years every yera, you are creamy layer. It means that if this annual income is less then Rs. 8 lakhs for any one of the three years you are a non-creamy layer. You can check here for non-creamy layer.
2. Is your father/mother is central gov. officer?
For Central or State Government officers- If
(i) parents, either of whom is a direct Class I officer or
(ii) parents, both of whom are direct Class II officers or
(iii) parents of whom only the father is a direct Class II officer and he gets into Class I at the age of 40 or earlier
then you will come under creamy layer.