ATTC currently runs 6 AICTE approved three years diploma courses, namely Diploma in Mechatronics (DM), Mechanical Engineering (DME), Tool & Die making (DTDM), Manufacturing Technology (DMT), Computer Engineering (DCE) and Civil Engineering (DCVE) and has an intake capacity of 45 students per trade. ATTC has also started with a brand new course of Diploma in Civil Engineering which was approved by AICTE in the year 2016.

2. Center for Computers and Communication technology (CCCT), Chisopani, South Sikkim

It offers Diploma Engineering courses which are approved by AICTE, Govt. of India since 1998 and is affiliated to State Board of Technical Education (SBTE), Government of Sikkim. It offers 3 years Diploma in:

a. Computer Science and Technology.
b. Electrical and Electronics Engineering.
c. Electronics and Communication Engineering.
d. Civil Engineering.

3. New Polytechnics

Two new polytechnics are coming up at Mangshila, North Sikkim and Yangthang, West Sikkim. A new Engineering College funded by Rashtrya Uttchatar Siksha Abhiyan (RUSA) is coming up at CCCT Complex in near future.