Currently, the way we're saving exam answers are by attaching it onto the user's browser memory. This means that the answers are saved only on the current browser & on the same device he was using when taking that exam. Since we do not save a user's exam progress (for uncompleted exams) in our database, there is currently no way to make them available across different devices.
Note that the exam progress and exam results of different things - Saving the progress within exam without finishing can’t be synced across devices but the actual results will show on different devices after they’re finished.
We are breaking down the very large topic exams so that it’s more likely that people can finish them and won’t need to come back to them.
Option: While its not ideal, an option maybe to just finish the exam on the phone, then come back to it on desktop and use the retry incorrect option. That would at least allow them to continue with those that were not answered and those that were marked incorrect on the phone.