Hi Shikhar, Keep on attending Sumit Sir's classes on these topics and solve the questions being taught. He will tell you in the class how to grasp the concept and solve using strategies. You can practice using topicwise tests as well to get more clarity on where you are making mistakes.

varc doubt i have covered all parasummaryand rc  question including lod 1 ,2 and jetpack , so while giving mock i realize i dont have a good command for parasummary question , so tell me other resources from which i can cover more question for these two topics.