sir how can I score full marks in physics. Is NCERT is enough to get full marks physics cbse board. what will i do in just 4 days. My teacher said that physics is very very toughest to score full marks . How will I study for geting it ? already i lost good marks in english, if I score full marks in physics, maths , chemistry , and biology then only I get good marks......

First of all don’t put pressure on yourself or else you won’t be able to perform at your highest level. To score full marks in CBSE boards it is not that tough as your teacher said. You just need to plan it properly and execute every part and word of it.
Plan each chapter properly. You have four days. You have studied earlier for preboards so you know a bit of the each chapter as well. In these four days sstudy everything from NCERT. Learn everything given in the book, including the Questions at the end of chapter and also questions given in between. Don’t study from any other source, stick to NCERT for the boards. The questions will solely come from the book or from inside the chapter.