GMAT

Yes, those who have some knowledge can take a GMAT sample paper before starting their preparation. It will give them insights on topics they should ideally be tackling as and when they prepare for the exam.

On the other hand, those who do not much about the GMAT exam can also take a sample paper to have an understanding of the exam pattern and their weaknesses and strengths. And based on these analysis, make a prep plan.

No, as such there are no previous year's sample papers available for GMAT exam online or offline. There are official resources and some trusted sources that offer sample papers in a book and also diagnotic tests online. Since the GMAT exam is online and also an adaptive test, plus conducted frequently it gets difficult to get hold to previous years GMAT papers.

Yes, you can score high on GMAT after solving sample papers. The reason is that you get hold of the exam pattern and question types easily. It is always better to practice before exam day.

Yes, this can be a coincidence that you find similar pattern or identical questions on the main GMAT exam day as on its practice tests. This is a benefit that applicants must put to good use when they solve multiple sample papers of GMAT exam before the main exam day.

Totally. Solving practice tests is the best way to learn. You get used to the exam format. It shows you your weak spots. Also, sitting for that long is tiring, so it builds stamina.

Maybe. Some schools like UCL might not ask for it. But top ones like LBS usually want it. If you have lots of work experience, they might waive it. Always check the college website.

Yes, majority of European universities require an MBA applicant to submit GMAT scores. The GMAT scores and cutoffs vary per university. Thus, applicants must check for requirements before applying and also preparing for GMAT exam. 

Scores ranging between 515 to 615 on GMAT are good score and help in meeting cutoffs for applying to German universities for an MBA program. Any score above this is also a good one to get admissions. The cutoffs may vary per university and applicants must check admission trends and stats before aiming for a particular score. 

Any GMAT score between 645 to 765 is a good score to aim for MBA colleges in Europe. MBA admissions in Europe not just require GMAT scores there are other requirements as well.

Ofcourse, a GMAT score of 755 can help you get admission to MBA at Harvard. Usually the cutoff ranges between 655-745, and a score of 755 is a good score to get through the process. But the supporting documents should also be at par in order to get a sure shot win for the MBA admission at Harvard.