Dear student, to be very honest this isn't a good way to manage PCM. These 3 subjects require equal amount of dedication and most important consistency. If you are regular with them they won't disappoint you. You can divide equal slots in a single day for each subject or if it becomes hectic for you then the least you can do is to study 2 subjects in single day and alter the combination for next day and so on. In this way you won't forget the concepts and as Maths and Physics require more practice so if you leave them for 2 days then you have to start from reading the concepts then solving problems.

All the best

Hope this helps