First step to become a mobile app developer at school level?
To become a mobile app developer at school level, you should have the knowledge of python and java atleast.
You can also go through youtube tutorials.
Good luck..!
mit developed a website for aspirants like you
http://ai2.appinventor.mit.edu
Hello Prateek! Start by learning basic programming languages such as C, C++, PYTHON, Java, etc. After that you can do certain short term courses online or at coaching centers. All the best!