Is the Book JEE Main Mathematics In 40 Days by arihant good enough to get a good score?
I have also solved this book.
Some of the questions are very good.
Many of them are of advance level. Given separately.
You can solve examples and exercise 1 .
It's enough for mains to get very good score.
But finally depend on the concepts how your concepts are some and how many times you have practice.
If you're short on time, go for it. Otherwise, I'd suggest going for a book that's more traditional and thorough.
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one thing i like to tell you that it depends on individual memory capacity and grasping power and also Arhant is enough but before that first learn clearly NCERT book of maths then u can get good marks
all the best