It is better you prepare P Block , but if you have a good grip over all other topics of Chemistry, then you may leave it.

p block is very important topic in JEE Mains, you know the answer and you can solve a question easily.

The best part is you can score quickly, if you know the answer of the question as they are not much time consuming.

It it is memory based. So, you will have to remember everything.

No it is not wise choice the leave hem completely because sometimes even easy questions too come in the exam. The best thing which you can do is to look at all the important chemical reaction and the important compounds. If you care running short of time then just give a quick look into the previous years questions asked as most of the reaction are important and come in the exam frequently.