The purpose of FW or Fee-Waiver seats is to let financially weak people pursue their dreams. AKTU has 4-5 seats for the same in every branch of engineering colleges.
The average fee of an AKTU-affiliated engineering college is around INR 1,35,000. This includes Exam fees, Training & Placement, Degree, Student Development services, etc. But for a student opting for a Fee-Waiver seat, the complete amount of INR 90,000 (as tuition fees) will be waived. This amount will be paid by the government.
The remaining fee that needs to be paid by an FW student is around 20-30k per year. Your college will let you know the exact amount as it varies from college to college.