any recommendation for book to practice more c++ besides this app

Answer 1

Very good question, Rohan, as SoloLearn C++ only covers C++03 without the standard library (C++11 and C++14 are more recent standards with many changes). Also quite some of the questions in the quiz are really bad code noone should write (but might help understand operator precedence).
There's a nice question on stackoverflow that might help you and that has been thoroughly answered: http://stackoverflow.com/questions/388242/the-definitive-c-book-guide-and-list
Pick some of them who might fit your needs.

Answer 2

Deitel. How to program C++ 9 edition

Answer 3

let us c++ by yashwant kanetkar
c++ by sumita arora
go through these
m sure u ll like