In most cases, you cannot directly fill a diploma form after completing 11th grade. Diploma programs typically require you to have passed either 10th or 12th grade.

Most diploma programs have a minimum eligibility requirement of passing 10th standard (secondary school) or 12th standard (higher secondary school) with a minimum percentage (often 50%).

The most common path is to finish your 12th grade and then apply for a diploma program. This will give you a broader range of diploma options and potentially better job prospects. A few institutes might offer diploma programs with eligibility after 11th, but these are less common. It's best to check with the specific institutes you are interested in to see their admission criteria.

I hope it helps!