Hello,
You can definitely deal with both, for that you need to have belief in yourself and make timetable accordingly to devote yourself.
See, if you're weak in a particular subject, the only way to score well is understanding the concepts clearly, re-reading time and again and practising it. Since, science subjects are not something one mugs up. If you feel like you need guidance, ask someone who is well versed in Physics to help you, or you can watch Educational Videos on Youtube for Physics to get concepts clear, if that helps you.
Now, coming to your preparation part, you can refer to previous year questions. It will help you in knowing the pattern of examination.
And regarding books suggestion,apart from NCERT Books, you can refer the following ones-
For Physics-Fundamentals of Physics by David Halliday, Robert Resnick, Jearl Walker
For Maths-Mathematics for Class XI by RD Sharma
Hope, this helps
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