I am an average student and have to study following topics on my own for the exam :
The measure of a bounded interval in $\mathbb R^n$ , the Riemann integral of a bounded function defined on a compact interval in $\mathbb R^n$ , Sets of measure zero and Lebesgue’s criterion for existence of a multiple Riemann Integral, Evaluation of a multiple integral by iterated integration.
Please can anyone suggest some good self-study book providing good insight into the above topics ..
I found the second edition of Elementary Classical Analysis by Marsden to be a gentle and geometrically motivated guide to these topics. The topics you mention are covered in Chapters 8 and 9. The book is also good for studying since it contains many problems for each chapter, with half of them (the odd ones) having solutions in the back. It's a bit lacking in measure theory since it mainly talks about sets of measure zero for Lebesgue's theorem. I don't know how far you want to go in measure theory - for example if you want to see the existence of non-measureable sets. If you do want to go further into measure theory, which naturally develops into the study of Lebesgue integration, I would suggest the fourth edition of Royden.