Yamini, if NITs are your goal, with all due respect from 38 percentile to be able to score atleast 97 percentile, what you should not be doing is rely on easy topics. You need to work double harder than you have already put in. You need to focus on the topics that carry more weightage over the others. That way you have a chance to score more. Our JEE Knockout package can help you in your preparation: https://learn.careers360.com/knockout-jee-main-april/ . Alternatively, the topics that you need to focus to score more are:

In Physics, Modern Physics take the top slot with 5 questions. Heat and Thermodynamics, Optics, Current Electricity, Elcetrostatics get 3 questions each. Magentics has 2 questions and the rest get 1 question each.

In Chemistry, Transition Elements and Coordination Chemistry, Periodic Table and Representative elements take 3 questions slot. Thermodynamics and Gaseous state, Atomic structiire, Chemical Bomding, Chemical and Iconic Equilibrium, Solid State and Surface Chemistry and Nuckear Chemistry and Environment get 2 questions slot eacch and the remaining get 1 question each.

In Mathematics, Co-ordinate Geometry gets 5 questions. Limits, Continuity and Differentiability, Integral Calculus get 3 questions slot each. The rest get 2 and 1 questions slot. For complete breakdown, please read our article: https://engineering.careers360.com/articles/jee-main-syllabus-weightage

Hii!
You haven't mentioned any relevant details related to the question you asked. Kindly restructure the question and ask agin inluding the name of the examination you are talking about, the subject stream related to it or any other important information. You can tag the field with the question or ask in comments section.
Hope you understand.
Good luck!