Hi Akanksha,

To attempt JEE Main mock test in Hindi I will not recommend any third party app as NTA(National Testing Agency) has a mock test section on its official website only.

Website Link - https://nta.ac.in/Quiz

Just copy this link, and paste it in your browser. Then select JEE Main exam and any relevant shift. Then LOGIN using the sample login menu and while reading instructions change your language from English to Hindi so that you will get whole Mock test in Hindi.

Feel free to ask doubts in the Comment Section.

I hope this information helps you.

Good Luck!