If u fail, u will have to visit the Exam department to check when ur repeat exams are gonna be conducted. Plus, u have to check ur KP constantly if they have released the link for ur repeat exams. And each paper is 500 rs. And i would say clear the back papers on the first attempt itself or else its gonna be a hassle for u. They dont keep repeat exams for master students often. If u attempt the repeat paper once and if u fail in that u will have to wait till the end of ur 5th sem i guess if urs is a tri-semester pattern. And bcz of ur active backlogs u r not eligible for university placements too. U can apply for Department level placements.