The following books are Recommended For EEE Studentz 3rd Semester for Easy Understanding :
1. Maths- singaravelu, Veerarajan or G.Balaji
2.Electron Devices and circuits(EDC)- Bakshi, salivahanan
3.Electromagnetic Theory(EMT) - GANGADHAR, Bakshi
4.Measurement and Instrumentation(M & I) - Gnanavadivelu , Bakshi
5.Environmental Science and Engineering(EVS)- Ravikrishna
6.Data Structures and Algorithm (DSA) - Mark Allen Weiss, REVATHY and POONKUZHALI
The above books are easy to study and also upto standard. If you think that anything is wrong or other author is good please comment below and help other students.