Hello,

Even if you didn't study your class 11th syllabus, you must be having your class 11th Books and probably notes. The first suggestion I want to give you that take the offline coaching classes where students are very less so that the teacher focuses you on more. Or take home tution.

After that, analyse your entire class 11th syllabus of all the Subjects (Physics Chemistry and Biology), and then watch YouTube videos According to your class 11th syllabus. You will find videos of each and every section. Then go through the past question papers of NEET, and analyse the entire NEET question papers and start preparing according. Don't waste even a single minute. You will have to study minimum 8-10 hours on a daily basis, as you have to study both class 11th and 12th and you will have to prepare for NEET too.

To see the entire NEET syllabus, please go through this link

https://www.google.com/amp/s/medicine.careers360.com/articles/neet-syllabus/amp

Good Luck.