Hey @azam_iqbal , First of all I would like to tell you price which is on below link:
https://cloud.google.com/appengine/pricing , you should read Daily and monthly charges paragraph.
Now let me come with one post which is here Billing Information
This will help you alot. YOu do not out $200, just add your credit card and your study will complete in $50 and once your study will complete remove all forms from there Server.
One more thing which will reduce the cost which is Briefcase CLI So, there will be no need to login and there will be no charged for downloading data from the server.
Please remember to close out question threads as 'solved' once you have a solution or a satistactory answer 
.
Best,
@iamnarendrasingh