Well speaking of grading in BITS, the first thign comes to my mind is Relative grading.
Academics are fine, as almost all teachers are great, involving multiple components of learning like, midsem and comprehensive exams, quizes, online tests, labs etc.
These components grow your interest towards subject in more intuitive way. But sometimes it becomes a tough job to manage courses and grades.
But if you’re asking about difficulty I’d say some courses are moderate where some are difficult depending on the instructor.