Colleges in USA

Top international colleges like Harvard, Cambridge etc. do not have any fixed eligibility criteria for getting admission in one of their colleges. It completely depends on the outlook of the candidate. Performing well in international entrance exams like GMAT/GRE helps as that is one of the main indicators or measures which are used by foreign universities to award admission. The candidate should also have a strong undergraduate degree (Academic) and strong inclination towards extra-curricular activities. All these factors combined should help you portray a decent application for gaining admission in the top colleges abroad.
Moreover, many reputed universities require the candidate to have completed their Masters before they can secure admission in a PhD program. Hope this helps!!

Getting admission in Harvard University for engineering: If you are applying outside the United States then you are considered as an international applicant, but the procedure to get into the Harvard University for engineering is same as the student of United States.
For admission in Harvard University, the main thing is the required standardized test scores in either SAT or ACT. Normally, you are required to take two SAT subject tests.
That can be English and mathematics.
Strong English proficiency is also tested by Harvard University and for that, you need to take TOEFL exam.
After you have cleared the cut-off to enter the Harvard University, they have a provision of taking an interview of the candidate.
If you believe you need a financial aid then you need to fill it in the form that you need financial aid from the Harvard University they will check and factor many things and consider that you are eligible for financial aid.
If you are not selected for financial aid program, it will not affect your candidacy.

The difference between Max level 1 and Max level 2 exam for Massachusetts Institute of Technology are as follows:
Number and operations level 1 measures are more basic understanding of topics than level 2. For example, level 1 covers arithmetic of complex numbers and also covers graphical and other properties of complex number level 2 include series and vectors.
Algebra and functions level 1 contains mainly algebraic equations and functions, whereas, level 2 also contains more advanced equation and functions such as exponential and logarithmic and trigonometry.
Geometry and Measurement: A significant percentage of questions at level 1 is a devoted to a plane geometry and measurements, whereas, on level 2, the concepts learned in plane geometry are applied in questions on coordinate geometry and three dimensional geometry level 2 also includes questions about ellipse hyperbola and polar coordinates and coordinates in three dimensions.
Trigonometry questions at level 1 are primarily limited to right angle trigonometry and fundamental relationships among trigonometric ratios, whereas, level 2 trigonometry emphasis on inverse trigonometric function trigonometric equations and identities and laws of Science and cosines.
Data analysis statistics and probability both level 1 and level 2 include Mean, Median, and Mode range data interpretation and probability where is level 2 also include standard deviation but to level 2 also includes quadratic and exponential regression.

You should be able to decide by yourself if you feel it is correct to pursue a course in MSA after completing your BDS. They are two very different fields with different scope. If you do not want to pursue dentistry and switch your line from BDS to MSA, it is entirely your choice.
The MAS educational experience seeks to develop critical administrative competencies in a supportive learning environment in conjunction with specific and clear feedback.
The basic eligibility criterion for MSA is Graduation from a 4 year, regionally accredited undergraduate program or equivalent.
The other prerequisite are maintained a cumulative grade point average of 3.0 (B) in their undergraduate studies, two letters of recommendation, Personal statement of purpose, English Proficiency test.