Nothing much different. You need to work hard in both.
If you work smart and hard then the latter is easy. People generally confuse smart work as a substitute or an alternative for hard work. But it’s actually just something which ensures your hard work pays the effort you put in.
And mainly focusing on not making mistakes. People think it’s a -1 but it’s actually -5 from what you expected so it’s like a big deal. Know where to skip questions and where not to.
Unlike what people might advise about books and stuff its more about time management, efficiency, accuracy practice and luck as well.
NCERT is just fine, actually enough to score really high. There are hardly 5 to 6 questions which come from outside NCERT. That accounts for like still 20 to 24 marks. So its useless to focus on those and trying to secure those questions.
Read NCERT properly. Start solving more and more questions and time them. If you see similar questions in place do then as well, it will teach you to identify and sort familiar questions from the unfamiliar one’s faster and will obvious help in knowing what’s the logic and formula required.