Hii!
No, you will not face any problem while registering for NEET UG entrance exam because if biology being a optional subject, because your subject combination is considered as PCMB. The eligibility criteria for the exam states that the candidate must have passed class 12th with minimum 50% marks in PCB plus English as an aggregate, from a recognised board of education. So, just check how much you score excluding maths. If you Satisfy the criteria, you can apply for the exam.
Hope this helps.
Good luck!

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