Need some simple changes in existing Android Quiz Application

IMP: This is not making a new app but making changes to the existing app. READ THE REQUIREMENT BEFORE YOU BID. Check attached file for micro-level details(all that has to be done) We have a working full fledge android quiz app(native) backed from a web server. Everything is functional now and we can take quiz(tests)-reading-listening-Multiple [login to view URL] articles-word meaning. Fully working. We need some simple changes but our previous developer is not available so we want someone to make upgrades to the existing system. Summary of changes required: We have one question per screen now, we want it nested(sub-questions within the question). Timer option for the question set Manage hierarchy--- level-(then)--sets---(then)---questions 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) Some Graphical-design enhancement Check attached file for micro-level details(all that has to be done) Priority for the freelancer who can do it quickly. Freelancer also needs to code/develop or extend required php+mysql part. What will be provided: Java source code(Gradle complied in the android studio) Cpanel details 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. We would go for refunds if deadlines(deadline+10 working days) are not met. 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).