Dear Student ,

As an e-resource , you can search for NCERT books which is available to read as well as from some official websites .

Some channels like Byju's  , Unacademy , Vedantu , Khan Academy are available in youtube which will guide you for Organic chemistry NEET preparation . You can also visit NPTEL and watch few lectures relevant to your syllabus for better understanding of the concepts .

For your reference , you may follow some tips regarding your NEET preparation from this link:

https://medicine.careers360.com/articles/how-study-chemistry-for-neet

Hope this helps !