Dear Student ,

Look, Purpose of all Engineering exams is same .. to get admission in Engineering colleges by clearing the required cut off . But , the quality of exam is generally depended on the following factors :

• Question Difficulty level
• Question Pattern with time allotted for that
• Syllabus

Based on that, no doubt JEE MAIN and JEE ADVANCED are the best Engineering exams for B.tech in India , followed by :

• BITSAT
• VITEE
• SRMJEE
• COMEDK UGET

and other state level exam like : MHT CET , KCET, AP EAMCET, TS EAMCET , WBJEE etc are the exam conducted by individual authorities .

For more details, refer this :

https://engineering.careers360.com/articles/top-engineering-entrance-exams-in-india

For M.tech: GATE is the best exam as per it's hardness level and question pattern with several papers

For more details about GATE , refer this :

https://engineering.careers360.com/exams/gate

Hope this helps !