Its all about the right planning

Few months to go and you'll be facing a row of competitive exams.
Its very important that things are well planned in order to make maximum use of the precious resource - the time.
What exactly does it mean to plan the things ?
Well, firstly there is no single plan that works for everyone. Each student is different and so will have a different plan.
I will list down a few guidelines for you so that you can make the optimal use of your time.

Firstly make a list of topics at which you are weak
Note that the list should be as concise as possible.
A possible example of a list :

p-block elements : Nitrogen family
Fluid Mechanics : Surface Tension
Permutations and Combinations : Derangement
...
...
...
...

The list should clearly specify the chapter name and the sub-topic.
Now update your list in the following way :

p-block elements : Nitrogen family - NCERT
Fluid Mechanics : Surface Tension - HC Verma
Permutations and Combinations : Derangement - RD Sharma
...
...
...
...

The idea is to mention the suitable resource with which you are going to cover the topic.
Note that choosing the resource is an important step. Choose a wrong book and you are screwed. Its generally a good idea to decide your level of comfort with the topic and then decide the book. Do not think that you are absolutely blank and so you should start with scratch again. The end result in this way would be that you learnt nothing. So start with something tougher. Maybe you can choose to pick up JD Lee for p-block elements because you feel that you have done NCERT once but are still not fine with Nitrogen family part.

Now once you are done with making this list, here comes the crucial part : prioritizing the list.
For this, you need to to decide 2 things :
The order in which you'll cover the things
and the time you will devote to each topic

Both of these things are equally important so you should spend plenty of time to decide this based on your level of preparation and your intelligence/aptitude.
The next important step is - executing!
This is where most people fail
Just sit down, open the books and start solving the problems!
Many people wonder what to do ? Let's bother seniors and ask what they did. Let's google it. Let's post a useless quora question
Shut down the damn computer, open the books and start reading with a pen and paper in hand to solve problems!
Do it and I assure you that in the end you will be comfortable with that topic and will clear JEE with flying colors
All the best :)