Hello there!

Greetings!

You haven't mentioned the name of the exam about which you want to know whether physics portion is difficult or not,  without knowing the name of the exam I cannot help you so do let me know it so that I can help you with relevant and detailed informations;  but in case if you are asking about neet examination then yes portion is difficult,  actually most of biology students don't like physics,  the main reason for this is mathematics involved in understanding and solving problems so students do find physics section difficult.  But with good preparation you can score well in physics, you should clear all your concepts and get practical knowledge of Subject and once you complete the whole syllabus of Physics for neet go through past year and mock test papers mock papers, these will help you to  identify your areas of strength and weakness and you will know what kind of questions are supposed to be asked in the nda examGood luck.

Thankyou