Will 3_4 months is enough to get good rank in jee (with good skills and basics)

If you have good hold on basics then you can prepare in 3 or 4 months.

You can follow the below strategies

You can make your proper time table. So, that you can easily complete your syllabus on time. Set your day to day and weekly targets and try to achieve them.

You can take help of previous year papers to know the exam pattern and level of questions.

Practice plays a very important role in scoring good marks and to increase your speed during exam. You should daily solve complete mock test series to analyze your preparation level at regular interval of time. It is very important to do complete analysis of your mock test series. So, that you can learn from your mistakes. Knowing your strength and weakness and regularly working on that is very important.

Give proper time to revision. Last 15 days you should only devote to revise your syllabus and don't pick any new topics on last days.

All the Best for your Preparation!!