M.Tech

Hello Monish
Generally, the required average academic score to pursue postgraduate degree in engineering is 60% (and above). However, top ranking universities will require scores of 80% and above. This doesnt mean that students with a 50% academic score will not be able to study abroad. There are various lower ranking universities that accept 50% score.
Students with scores of 50% to 70% can look for universities in countries like New Zealand, the US, the UK, Ireland, China and Australia. Students with 70% can look for universities in countries like Canada, Germany, Singapore. That said, all top ranking universities (globally) require a minimum of 80% to qualify.
A mandatory standard test for language is also required like IELTS/TOEFL/PTE, which will differ from one country to another. In some countries, you will be required to take up competitive exams such as GRE/GMAT to prove your competency. Ensure you take these tests six to nine months prior to the application deadline. This is necessary in case of repetition so that you have enough time to retake the test. Book the test in advance so that requested test dates are available.