No, it’s not at all late..Even if you start now also you can pass out with flying colours 🤗
Past is past.But still You have around 3 months for your preparation..As you have not studied anything..
Start reading Biology ncert as Biology carries more weightage in neet.Solve MTG ncert at ur fingertips.
For physics and chemistry,see all formulas from handbook.If u need I can provide u free pdf of it.
Then write mock tests weekly and see how much you are scoring.
Accordingly study those weak chapters and most important be confident.I’m uploading final 3 min revision videos on my youtube channel Medlife (AIIMS).If you need,you can watch them..
Let’s hope for the best,exam will be easy
Start studying sincerely atleast from today