Good Morning

Hope you are good, as per your query and according to me preparing Both JEE main and Boards simultaneously is not big deal, you have to keep some important things in mind, to ace both first take proper knowledge about syllabus and exam pattern of JEE Main and Boars and understand the difference, do proper planning to finish your syllabus and find out your best edges(chapter) for you in your syllabus, just from your strong topics you may score more. develop daily target and focus on archiving every target.

It is takes time so, keep dedicate and motivate yourself daily

Here is some resource which makes your journey easier:

Just Study 32% of the JEE Main syllabus and Score up to 100% checkout given link below:
https://engineering.careers360.com/download/ebooks/jee-main-2022-june-shift-complete-analysis

JEE Main Online preparation: https://learn.careers360.com/knockout-jee-main-subscription/

Hope you found it helpful
All the best!!!