My template was rejected by saying isn't at the quality standard required to move forward

My item ConaxQuiz template was rejected by saying isn’t at the quality standard required to move forward. Please review and let me know how and what i will improve.

This looks very barebones and of low quality. The image in the left panel doesn’t load, the menu looks lazy, colors do not match (left panel bg vs the blue in the content).
In general, you will need something much more advanced.

why my 4 item was rejected and what i can do for approved my file

You should start by creating your own thread and share your item there so you can get feedback.