It's understandable that you want to avail the benefits of your EWS certificate for Delhi University (DU) admissions through CUET UG. However, the process for changing your category after submitting the CUET UG application form has likely closed.

The National Testing Agency (NTA), which conducts CUET UG, usually provides a correction window after the application deadline. During this period, candidates can make certain changes to their application forms, such as updating personal details or category. However, this window typically has a specific timeframe, and once it closes, no further modifications are usually allowed.

Since you applied in the general category initially, your data would have been recorded as such in the CUET UG database. Delhi University will primarily use the data provided by NTA through your CUET UG application for admissions. While DU has reservation criteria for EWS candidates (10% of seats are reserved), they will likely consider the category you mentioned in your CUET UG application.

Therefore, it might not be possible to directly change your category to EWS in the Delhi University admissions portal if you have already submitted your CUET UG form as general.