Between your studies try to take small breaks which will refresh your mind and you will be able to focus more strongly.
Find a suitable and silent place to study where you don't get distracted often and can focus on your study and work.
Keep something around yourself for eating and hydrating purpose, so that you don't have to stand from your seat again and again.
Make a to-do list of your projects and mark the deadlines, do that work on an immediate basis.
Try to do work study which will increase the power of doing things, more focused and try to help each other.
Set a study schedule, distribute every subject time and learn, work accordingly to that.
Do not try to multitask your work so that you won't be able to focus on things