Hello Maam,

First of all it is a very good decision to start the preparation early in order to get a head start. Whatever you do just don't go for the highly expensive stress building coaching classes which instead of making students learn add onto pressure.Your son should devote maximum attention towards building the concepts and eventually polishing and perfecting each topic thus mastering the preparation. For this you can go for books from Arihant publications and Disha publications.Try going with ncerts and make progress everyday.

For best detailed tips you can refer this article below:

https://medicine.careers360.com/articles/neet-preparation-tips