Dear aspirant,

According to your question and taking into consideration that you want to know about whether you would face trouble in getting IIT and NIT considering you are weak in physics and good in maths and chemistry.

I would like to tell you that many students have atleast one subject on a weaker side than the other two subjects. So, atleast work on the weaker subject to get atleast decent marks in jee mains otherwise you would definitely face trouble.