Dear aspirant
Thankyou for asking your doubt.
No using only NCERT will not fetch you enough marks.

Start making weekly timetable. Be strict while following it. 
If you have joined a coaching institute then make sure to read the chapter that they teach on the same day.
Also solve mcqs related to that chapter after reading it.
Solve atleast 50 mcqs each day of one subject.
Divide time and study each subject in a day.
For eg. 1 n hlf hr biology
1 hr chem
1 n hlf hr physics.

For biology read ncert throughly as questions come from ncert directly.
Solve mcqs from any of these books
Arihant publications dc pandey.
Mtg complete neet guide.
Make pnemonics to memorize certain examples. You can see several videos on youtube for it.

For chemistry solve
Aakash study material and allen study material. You can also use modern abc.
You can see dushyant kumar sir's channel on youtube. He gives certain short tricks as well which saves time during exam.

For physics make your own formula list.
And keep learning formulas. Write the formulas 5 times so as to learn. It will be easy for you to revise when you make your own list of formulas.
Books for physics:-
Universal self scorer errorless book.
Mtg fingertips.

Refer to any book that i have mentioned. Atleast stick to one book. But you will need books to solve mcqs so use a book for mcq it is very important.
For each subject make your concept very clear.
Have confidence.

All the best.

I hope my answer was helpful.

Hey Dreddy,

No , you can't score more than 300 only study with NCERT.

If you want to score more then there are lots of books are available in NET or for best way you can ask from your teachers if your teacher says NCERT is enough then please change your teacher.

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