A common mistake made by many students is to start with reference books directly while their concepts and theoretical knowledge are not very strong. NCERT books are the best books to start your preparation.
Even a simple tool like Google Calendar can be used to allot time or days to chapters/sections. It can be more effective than a printed calendar since it will give you reminders for different events.
The common mistake made by most students is they never review what they have solved. You should spend at least 6-7 hours to review the process.
Amplify your revision by solving practice questions on the topic from reference books instead. This will help you immediately understand the concepts you have just studied
Once you are thorough with your NCERT books, move on to reference books.. Reference books will help you greatly in building knowledge about concepts through practice.
Make a list of the 3 most important things you want to do for the day and try your best to accomplish these tasks. It would not only help you to avoid distractions but would also provide a sense of accomplishment
Whenever you are learning a topic, totally focus on it and ensure you learn everything necessary for exams.