are there any upcoming mock test Or competitive exams? that are helpful.. for jee

Hello aspirant,
You can try for entrance exams like TS EAMCET, KCET, AP EAMCET, BITSAT, VITEEE, etc to have a practice of entrance exam and syllabus will be similar though the difficulty level is less than JEE exams but can give a practice and experience to you.
Best Books for preparation of JEE exam are listed below.
Physics:
NCERT Physics Class XI & Class XII
Concepts of Physics by H.C. Verma
Chemistry:
NCERT Chemistry textbooks for Class XI and XII
ABC of Chemistry for Classes 11 and 12 by Modern
Organic Chemistry by OP Tandon
Physical Chemistry by OP Tandon
Mathematics:
Mathematics by Arihant Publications
Objective Mathematics by R.D Sharma
NCERT Mathematics Class XI and Class XII textbooks
To get more information go through below mentioned link.
https://engineering.careers360.com/articles/best-books-for-jee-main
For JEE sample question papers go through below mentioned link.
https://engineering.careers360.com/articles/jee-main-sample-papers
You can check below given link to get free mock tests for JEE
https://engineering.careers360.com/articles/jee-main-mock-test
Also, visit below mentioned link to get more information about JEE Mains Knockout.
https://learn.careers360.com/knockout-jee-main-april/
I hope this information will be helpful to you.
Good Luck!!