1) To get the best books for self study you should visit the link below. It have a elaborate list of books which can really boost your preparation:

https://law.careers360.com/articles/best-books-for-clat

2) Some of the best channel for any law preparation are:

• Law prep Tutorial
• GRADEUP CLAT
• LEGAL EDGE
• CLAT GURUKUL
• TLOI ACADEMY
• FOOLS-DEN
• PRO-TALENT ADMIN

BEST APP FOR CLAT can be the apps you may use for mock tests and other purposes.

4) Start your preparation as soon as you can. If you can start from today. The more time you will get, the more you will be benefitted.

I hope my answer helps. All the very best for your future endeavors!