Written Test:

Online test consist of two parts- Aptitude & English - NO NEGATIVE marking.

Aptitude consists of 3 parts comprising of 70 questions (time management needed here)

1. Non verbal reasoning(35 questions)
2. Verbal reasoning(20 questions)
3.Quantitative (15 questions)

RS Aggarwal is sufficient for aptitude but try to do fast and so all questions as there is no negative marking.

Second part is English it has 8 sections and 100 questions.

1. Tenses(10 questions)
2. Articles(10 questions)
3. Verbiage (synonymms 10 questions)
4. Confusing words (similar sound words typ principle/principal etc 10 questions)
5. Reading comprehension(10 questions very easy 1)
6. Subject verb agreement(20 questions do this from cat material or simmilar)
7. Prepositions(20 questions easy one)
8. Articles (10 questions)

Each section has different cut of may b 60% in English and 70% in Aptitude which can be increased or decreased by Tech Mahindra. [I am not sure about this thing]

It's not a GD round but sometime they will conduct Essay Writing round

Nope

In Technical round just prepare what have you mentioned on your resume and project too. and they mainly check your communication skills that's it.

Formality round they will ask for your marksheets photocopies and yes passport is mandatory as per my knowledge.

Criteria
10th : 60%
12th : 70%
BE/BTECH : 60%