GRE

A score about 320 will be good to get into premiere university like UCON, Renesslar.

Hi Rahul, practice test will help. Please read this, it should help
https://ask.shiksha.com/what-skills-are-required-to-score-good-marks-in-gre-exam-b-qna-3789805

Hi Damana,
Since you know its late you should be searching for universities having deadlines and prepare your application without more delay. You may find options till Nov or Dec.

If the GRE score is very good it may help balance the low GPA. It depends on how the university evaluates your profile, how selective they are and also your overall profile.

Hi Sindhuja,
This is not explicitly mentioned on their website however they did mention the fact that ' The average GRE score of graduate students in engineering programs is around 1100 on the math and verbal sections, when combined'. Secondly, you must submit a TOEFL score and not IELTS.
I hope this helped.

310 and above is considered to be an ideal score to be considered by ranked universities. You may check the university websites and take a look at the GRE scores they prefer. Requirements vary with universities so always go through the respective university websites.

Yes, you can. You need to score 65 percent marks in engineering.

You are eligible to appear for GRE. The eligibility criteria in majority of USA universities for MS is 16 years education. Therefore, you will face challenges in getting admission as you have only 15 years of education.

GRE is necessary for securing admission for competitive courses like mechanical, aeronautical, civil or automobile engineering.
Other than that, it is not mandatory. You need to appear for scholarship tests like IELTS or TOEFL. German language certificate could be an added advantage but not mandatory.