Hello Rajib

You should not worry if you have got gress marks in chemistry. You have mentioned that you havd scored 56% in PCB then you are eligible for appearing Neet.

Make sure you will work hard for chemistry while  neet preparations.  Focus on Important topics and give time to physics abd chemistry numerical problems.

Make time table and study accordingly then you can easily Crack neet and will be able to get a mbbs seat.

Also if you have strong base in biology then you can give more time to biology.

Here is one link , you may refer it for neet preparations It will help you a lot and will work as class room at home..

https://learn.careers360.com/medical/neet-preparation-material/#:~:text=Why%20%E2%80%9CKnockout%E2%80%9D%20package%3F,ready%20for%20NEET%20online%20exam.