History = model.fit([X, a0, c0], list(Y), epochs=100)

The deadlines here automatically adjust with no penalties if you miss them. So you don’t need to do anything: just keep working at whatever pace makes sense for you. What do you mean you wish you had gotten this earlier? I responded within a few hours of your original question.

Also note that if what you are really saying is to do with Financial Aid or anything like that, only the Coursera Help Desk can assist with that. There are instructions about how to contact them on the DLS FAQ Thread.