Greetings Raza!

Hope you're doing great.

It's good to know you've taken interest in some creative career option. Big cheers! Now, coming back to your question yes, there are many institutes/workshops who provide diploma and certification courses in Photography. However, Photography isn't just about clicking pictures. One needs to have an understanding of light and other technical details which require a certain level of science to acknowledge. Hence, most of the institute conduct entrance examination to intake their students.

Since you've mentioned that you're applying to an institute which required their candidates to submit certain photographs to analyse their photographic sense. I'll suggest you go along with diverse topics.

You can follow this link to explore several types of photography: https://expertphotography.com/types-of-photography/

All the best!

Hope, this will help. Do reach out in the comment section for any query. :)

Cheers!