I have a pretty good idea about the syllabus linking of 9th and 10th with 11th and 12th.
The syllabus of 9th class (Science)would be expanded and more new information and topics would be added when you reach the 11th class.Almost the same chapters just an elaborate version of them with more detailed paragraphs and lots of hidden information and facts between the lines of NCERT(Read as – Bhagavad-Gita).
Where as the syllabus of the 10th class would be used to prepare the syllabus of 12th class.Just more juice in there and lots of formulae and problems to solve.
Now coming back to whether you can fare well in NEET if you’ve been on some slippery flooring in your previous classes.Yes! You can.
When I entered the 11th class I joined Aakash Institute.The teacher was talking about something like Porifera and I was thinking that I heard it somewhere.I was shocked as shit to know that it was in the 9th class and I don’t even remember it.But before a month of NEET I decided I had to study Biology for a decent score and it took just a month to learn 11th + 12th biology NCERT by heart (I had no recollection of the 11th bio as I had learnt it just for school exams and was in my short term memory).
So just don’t worry you’ll do well.Just concentrate and study like tomorrow’s your exam.