First of all you should try to understand everything about NEET about the pattern of exam, syllabus, marking distribution etc ( in case you don’t know ).
Now without wasting a single day thinking that 2 years are there , start making your strategy and schedule.
You should take some guidance from experienced person or join any coaching for understanding the strategy for the exam.
I made this mistake in class 11th that I didn’t join any coaching assuming that I will do it by myself and till the end of class 12th I never studied for NEET , I just kept on studying for boards only. So I took drop and joined coaching. And see I am here doing MBBS from AIIMS Bhopal. So take guidance from coaching. If you think you can study without wasting lakhs of rupees on offline coaching then join some online course which are available at reasonable costs. You can join Arjuna NEET batch on Physics Wallah app if you are an aspirant of NEET 2024.