Hello Dear, I've read your project summary and I can develop an educational Android app which will be similar to Doubtnut as per your requirements and I am absolutely sure that I can do the project very well. Share further details related to the functionalities in the app so I can tell you the total time and cost required for the completion of the project.
Lets have a quick chat to discuss further.
I have extensive experience in designing and development of Websites, Mobile Applications, Management Systems and E-commerce or Online Stores Solutions.
Kindly have a look at my Portfolio and Client's reviews via this link,
https://www.freelancer.com/u/kamran2012
Thanks,
Faizan