So what is mindset?
In a simple language I would say its nothing but just thinking of anything in advance and preparing for it in your mind. To develop that kind of mindset you have to regularly tell your subconscious mind that
for example- If you have to get up at 5 am you have to tell your mind that tomorrow I am going to get up at 5 am at any cost.
You have to do this until its feeds in your subconscious mind. And ones you have develop that kind of mindset , it will soon become your habit.