Class 12th

You will not be offered any direct admission to NIFT Delhi even if you are a class 12th topper. Candidates must fill the NIFT Entrance Application and appear for the exam. If they clear the cutoff, admission is offered.

Yes, you can appear for the Panjab University LLB Entrance Exam if you are in Class 12th as candidates appearing for their final qualifying exams are eligible.

Congratulations on being a class 12th board topper. You must participate in the AIL LET counselling process to secure admission, as direct, merit-based admission for board toppers is not the standard procedure for Army personnel seats. AIL LET scores are used to create a merit list for counseling. 

It's difficult but in some colleges you may can get 

To join a Marine Engineering course after Class 12th, candidates need PCM with good scores of around 60% aggregate in PCM, plus 50% in English.

Candidates must appear for the IMU-CET entrance exam, clear medical tests, and apply to affiliated colleges, often with sponsorship opportunities from shipping companies after selection. 

Source: official site and may vary.

The Liverpool admissions can be very competitive and if you are applying as an Indian student, the admission requirements vary here. 

As per those admission requirements, Indian students would require a minimum of 85% in the top core subjects in higher senior secondary exams. The other subject requirements are given below - 

• A minimum of 80% in Chemistry 
• A minimum of 80% from one of Biology, Physics, or Mathematics
• A  minimum of 75% in English (not including Hindi, Regional Language)

It can be really good if an international student has 90% and is applying to Westford University College because the actual minimum requirement of around 55% in class 12th for an Indian applicant. Given are the subjects an Indian student should have in their high school coursework - 

• Accountancy, Maths and Economics for Business or Finance programs
• Physics, Chemistry, Maths for Westford University College IT or CS courses

All the requirements given above as well as the English language requirements.