Hello.
In order to be more productive you need to see in yourself that where you are lagging, your current preparation strategy are not helping you much so you need to change it, instead of focusing on chapters try to solve as much as question you can, try to solve question of different type, take the help of online resources, in this less  time span I would suggest you to solve all the previous year question paper at least you need to touch each type of questions which have been asked in the past papers that would really help you to improve your score.
You can also and enrol yourself in our knockout course for JEE Mains July session that may be beneficial for you, find the application form through the given link:
https://learn.careers360.com/knockout-jee-main-april/
Best of luck.

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