Hello dear student,
The best time of studying any subject is the time when you think you can concentrate easily and without any distraction. Studying any subject is only meaningful when you studying it with full concentration otherwise the time is wasted and you are not able to grasp anything. so when you feel light and you feel like studying physics are you feel like studying maths and you can think you can concentrate very easily without any destruction there you goes they you can study easily and peacefully. There is no time as perfect time it's a new and it's in your will if you want to study with concentration. I hope this was helpful
Best wishes
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