Need some simple changes in existing android app--document attached

IMP: This is not making new app but making changes to the existing app. [Please bid within the budget(max:200).It is just simple change task. Unnecessarily large amount bids will be [login to view URL]’t put placeholder amount and time. Won’t entertain such [login to view URL] time wasters.] PLEASE READ ATTACHED DOCUMENT. IT HAS EVERY MINOR DETAILS AND ALL THAT NEEDS TO BE [login to view URL] ONLY AFTER READING IT(IF YOU THINK YOU CAN DO IT OR READY). We have working full fledged android quiz app(native) backed from web server. Every thing is functional now and we can take quiz(tests)-reading-listening-Multiple [login to view URL] articles-word meaning. Fully working. Our previous developer is not available so we want someone to make some simple changes and upgrades to existing system. Summary of changes required: We have one question per screen now, we want it nested(questions within the question). timer option for the question set manage hierarchy--- level-sets-questions Graphical-design enhancement removal of some warnings(log-cat) Favourite or history(of words and performance monitor) some suggestion how it is loaded-security(and available offline) categories in articles Simple banner display(image ad) correction of bugs if any We cannot provide whole source code for review(before awarding and NDA). We can provide some sample code files from project. What will be provided: whole java source code(gradle complied in the android studio) Our developer can make required changes on the server(php/mysql). The web system has been already changed to adopt nested questions. Note: Current system is well written and clean(easy to understand) please make sure about the requirements before you bid. Need who can complete the project on time and with quality. We take deadline seriously. If you have any questions or need clarification, please ask before you apply. However, I may only respond to one who is interested in (I feel they can do it).