The answer here is No, but this question might be in your head because you saw many people scoring good marks
For this the reason behind is simple, that is, question papers contains most of the questions of easy or intermediate level (this may not be your case, if it isn’t, I feel you bruh ;__; ) most of the questions are directly related to the text book and you have multiple choices too. So, even if you give your 50% you will easily score 80+ or 8–9 CGPA that’s the reason why a student who has a habit of studying daily (i.e from the start of the session or from mid in some cases) are more likely to get 10 CGPA (CBSE)