Hi , there is no as such free seat in medical field . It's either government or private  with government seats having fees range from 5000 rs to 50000 rs and in order to secure a seat in government medical college you need to remember that your NCERT books are the best and you should have thorough knowledge of your subjects Along with regular revisions Along with NCERT you can go for other books like
For physics
Concepts of Physics by H. C. Verma

Objective Physics By DC Pandey

Fundamentals of Physics by Halliday, Resnick and Walker

Fundamental Physics by Pradeep

Problems in General Physics by IE Irodov
For chemistry
Physical Chemistry by OP Tandon

ABC of Chemistry for Classes 11 and 12 by Modern

Concise Inorganic Chemistry by JD Lee

Dinesh Chemistry Guide

Practise books by VK Jaiswal (Inorganic), MS Chauhan (Organic) and N Awasthi (Physical)

For biology

Biology Vol 1 and Vol 2 by Trueman

Objective Biology by Dinesh

Objective Botany by Ansari

Pradeep Guide on Biology

GR Bathla publications for Biology
Hope this helps

Hello dear student

The best Books for NEET 2021 -

Chemistry -

• NCERT Chemistry textbooks for Class XI and XII

• Physical Chemistry by OP Tandon

• ABC of Chemistry for Classes 11 and 12 by Modern

• Concise Inorganic Chemistry by JD Lee

• Dinesh Chemistry Guide

• Practise books by VK Jaiswal (Inorganic), MS Chauhan (Organic) and N Awasthi (Physical)

Physics -

• NCERT Physics Class XI & Class XII

• Concepts of Physics by H. C. Verma

• Objective Physics By DC Pandey

• Fundamentals of Physics by Halliday, Resnick and Walker

• Fundamental Physics by Pradeep

• Problems in General Physics by IE Irodov

Biology-

• NCERT Biology Class XI and Class XII textbooks

• Biology Vol 1 and Vol 2 by Trueman

• Objective Biology by Dinesh

• Objective Botany by Ansari

• Pradeep Guide on Biology

• GR Bathla publications for Biology

Please visit the link for more information.

https://medicine.careers360.com/articles/best-books-for-neet#Best-Books-for-NEET--Physics

You can join Online courses at careers360 in very low cost , knockout neet 2021. Visit this link.

https://learn.careers360.com/knockout-neet-may/

Hope that's helpful

Best of luck

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