Hello dear student

You can appear for neet if you pass out physics , there will be no problem if you get less than 50 marks in physics provided you must have more than 50 marks in chemistry and biology .

The total marks of three subjects physics + chemistry + biology should make 150 .

It can be explained here : suppose you are getting 40 marks in physics,  then you must have 10 more marks in chemistry or  biology OR 5 extra marks in chemistry and 5 in biology so if you have 40 marks in physics , minimum 60 marks in biology and 50 in chemistry,  then also you are eligible.

The eligibility to appear in Neet

The candidate must have passed class xii with minimum 50 % marks with physics, chemistry and biology from any reputed university.

For details you may visit the link given below

https://medicine.careers360.com/articles/neet-eligibility-criteria