Hi , 

you should give equal time to both the subjects , as we all know that both subjects are important so you have to divide the time equally if you think that your maths is weak or your physics is weak so give more time to them. and if you are getting bore by reading same subject from last few hour so take a half an hour break than switch to other subject that will definately help you to maintain your interest . 

i hope this information is helpful for you 

for more queries just contact with us 

thank you 

good luck