How to study Signals and Systems for GATE?

Signals and System is more of numerical based subject. The best resource is NPTEL video lectures by Prof.V.G.K.Murti, IITM and Prof.S. C Dutta Roy, IITD . The lecture are best not just for GATE/IES even for university exams. Concepts and numerical covered with great depth.

1. Intro to signals and systems

1. Lecture-1
2. Lecture-2 
3. Lecture-3
4. Lecture-4
5. Lecture-5

2. LTI Systems

1. Lecture-6 

3. Fourier Series

1. Lecture-7 
2. Lecture-8 
3. Lecture-9 
4. Lecture-10 
5. Lecture-11 
6. Lecture-12 

4. Continuous time Fourier transform

1. Lecture-13
2. Lecture-14 
3. Lecture-15 
4. Lecture-16 
5. Lecture-17 
6. Lecture-18 
7. Lecture-19 

5. Laplace transform

1. Lecture-20 
2. Lecture-21 
3. Lecture-22 
4. Lecture-23 
5. Lecture-24 
6. Lecture-25 

6. Discrete time Fourier transform

1. Lecture-26 

7. DFT

1. Lecture-27
2. Lecture-28
3. Lecture-29

8. Z-transform

1. Lecture-30
2. Lecture-31