As you want to get the list of some of the best colleges and the career after B.Tech in Agricultural Engineering so here is the information of the same for you:

B.Tech. Agricultural Engineering Job Types

Agricultural Sales Engineer
Manager - Manufacturing (Agricultural Tractors)
Program Manager - Agriculture
Agriculture Portfolio Manager
Researcher / Fundamental Analyst - Agriculture commodities
Primary Production Managers - Expert Agriculture
Senior Agriculture Manager
Farming Consultant and Agronomist
Sales Manager - Agricultural Products
Subject Matter Specialist - Agriculture

Some of the Central Government Sectors where they can be recruited:

Directorate of Oil Palm Research
Indian Council of Agricultural Research
United India Insurance Company Ltd.
Dr. Balasaheb Sawant Konkan Krishi Vidypeeth
Natural Agricultural Innovative Project, Maharashtra
Cabinet Secretariat, Govt. of India, New Delhi
Indian Institute of Technology Kharagpur
Food Corporation of India
Indian Agricultural Research Institute
National Seeds Corporations
National Dairy Development Board

List of colleges:
Mahamaya Technical University - Bachelor of Technology in Agriculture Engineering
College of Agricultural Engineering & Post Harvest Technology, Central Agricultural University - Bachelor of Technology in Agriculture
Narendra Deva University of Agriculture & Technology - Bachelor of Technology in Agricultural Technology
Vaugh School of Agricultural Engineering & Technology (VSAET) - Bachelor of Technology in Agricultural Engineering
Dr.A.S. College of Agricultural Engineering, Ahmednagar - Bachelor of Technology in Agricultural Engineering
Mahatma Jyoti Rao Phoole University, Jaipur - Bachelor of Technology in Agriculture
Maharana Pratap University of Agriculture and Technology - Bachelor of Technology in Agricultural Engineering
Orissa University of Agriculture & Technology, Bhubaneswar - Bachelor of Technology in Agricultural Engineering
Sai Spurthi Institute of Technology - Bachelor of Technology in Agricultural Engineering
ACN College of Engineering & Management Studies - Bachelor of Technology in Agricultural Engineering
Sher-e-Kashmir University of Agricultural Sciences and Technology of Kashmir - Bachelor of Technology In Agricultural Engineering
Kakinada Institute of Engineering & Technology - Bachelor of Technology in Agricultural Engineering
Sanskriti Institute of Management and Technology (SIMT), Mathura - Bachelor of Technology in Agricultural Engineering
Agricultural Engineering College & Research Institute - Bachelor of Technology in Agricultural Engineering
BSA College of Engineering and Technology - Bachelor of Technology in Agricultural Engineering
Kerala Agricultural University - Bachelor of Technology in Agricultural Engineering
Mahatma Phule Krishi Vidyapeeth, Rahuri - Bachelor of Technology in Agricultural Engineering
University of Agricultural Sciences, Bangalore - Bachelor of Technology in Agricultural Engineering
Assam University , Engineering Faculty - Bachelor of Technology in Agricultural Engineering
Rajasthan Technical University, Kota - Bachelor Of Technology in Agricultural Engineering
Mahatama Jyoti Rao Phoole University, Faculty of Media, Jaipur - Bachelor of Technology in Agricultural Engineering
Tamilnadu Agricultural University - Bachelor of Technology in Agricultural Information Technology
College of Agriculture Engineering, Rajendra Agricultural University - Bachelor of Technology in Agricultural Engineering
North Eastern Regional Institute of Science & Technology - Bachelor of Technology in Agricultural Engineering
Baba Saheb Dr. B.R.A College of Agriculture Engineering & Technology - Bachelor of Technology in Agricultural Engineering
Warangal Institute of Technology and Science - Bachelor of Technology in Agricultural Engineering
Dr. Punjabrao Deshmukh Krishi Vidyapeeth - Bachelor of Technology in Agricultural Engineering
Institute of People's Science and Technology,Chitrakoot - Bachelor of Technology in Agricultural Technology
Dr. ZH Institute of Technology & Management - Bachelor of Technology in Agricultural Engineering
Indian Institute of Technology, Kharagpur (IIT K) - Bachelor of Technology in Agricultural & Food Engineering
University of Agricultural Sciences, Bangalore - Bachelor of Technology in Agricultural Engineering
Kelappaji College of Agricultural Engineering & Technology (KCAET), Tavanur - Bachelor of Technology in Agricultural Engineering
Acharya N.G. Ranga Agricultural University - Bachelor of Technology in Agriculture Engineering
Teerthanker Mahaveer University - Bachelor of Technology in Agricultural Engineering
Bidhan Chandra Krishi Viswavidyalaya - Bachelor of Technology in Agriculture Engineering
Aligarh College of Engineering & Technology - Bachelor of Technology in Agriculture Engineering
College of Technology, Pantanagar - Bachelor of Technology in Agricultural Engineering
Shivdan Singh Institute of Technology and Management, Aligarh - Bachelor of Technology in Agriculture Engineering
College of Agricultural Engineering - Jabalpur - Bachelor of Technology in Agricultural Engineering
NIMS University, Jaipur - Bachelor of Technology in Agricultural Engineering
College of Agricultural Engineering and Technology - Hissar - Bachelor of Technology in Agricultural Engineering
Uttar Pradesh Technical University - Bachelor Of Technology in Agricultural Engineering
Marathwada Institute of Technology - Bachelor of Technology in Agricultural Engineering
Chhattisgarh University - Bachelor of Technology in Agricultural Engineering
Dr. Balasaheb Sawant Konkan Krishi Vidyapeeth - Bachelor of Technology in Agricultural Engineering
Babu Banarasi Das University - Bachelor of Technology in Agriculture Engineering
Indira Gandhi Krishi Vishwavidyalaya - Bachelor of Technology in Agriculture Engineering
Singhania University - Bachelor of Technology in Agriculture Engineering
Vivekanand College of Technology and Management - Bachelor of Technology in Agricultural Engineering