Hello student you can start preparation now but can't register for IPCC/intermediate CA as the eligibility criteria for intermediate registration is candidates must hold graduation degree in any discipline from a recognized university.

You can start preparation now and it's better to start preparation as soon as possible it'll help you in clearing the  examination in first attempt as syllabus is very lengthy and student get less time for preparation so you can start preparation now.

Feel free to comment if you have any doubt

Good luck