Hello,
Since the course that were in 2 years in +2 (11 and 12) are combined in Engineering Physics, it is a vast subject to be able to read in a semester. I'm not saying it's tough though. But, the thing is that you can't leave this subject simply by saying that "I'll read in 3 days leave before board exam."
Even I, my topper friends and my other friends who deserved good marks secured only 32 in this subject.
Even Maha Dutta Paudel (MDP) Sir, HOD,Engineering Science And Humanities Department was shocked to see our result. So, it becomes a bit difficult for you if you simply neglect this subject.
But.......... You already have enough concept from +2. So it becomes very easy for you if you're updated daily.
Pay attention to Numericals. If your numerical goes bad on your exam your whole exam goes bad which ruins your whole semester.
If you've very less time to read, they're some chapters which can be solved simply by cramming 1 or 2 formulas. E.g. in optics, if you know some formulas of Newton's Ring Experiment , Polarization, Young's Single Slit Experiment (you probably have good concept on these topics from your +2) and know how to use them on formulas, you can secure good marks in less time.