Hello dear
That's the right time to start your preparation .
First of all complete basic concepts of your ncert of physics,  chemistry and Biology and yes for biology stick to your ncert , its like a Bible for neet students.
For chemistry ncert is also enough , you can use books like MS chauhan to make your concepts even better. Now for physics you can use DISHA NEET guide book , its perfect for neet for physics. 
After these practice previous 30 years question of neet and your preparation will  complete with this.
thankyou
Please feel free to ask your further queries if any.

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