After you have done the SeeD exam in Dollet you take the written tests to increase your rank. The top rank is A after rank 30.
You can take the written tests by going to the Menu - Tutorial - TEST
Here are the answers for all the written tests.
Level 1: YNYYYNNYNN
Level 2: YNYYYNYYNN
Level 3: NNYNYYYNYN
Level 4: NYYYNNYYNN
Level 5: NNNYYNNYYY
Level 6: YNYYNNYYNY
Level 7: YYYYYYNYYN
Level 8: NYNNYYNNYN
Level 9: NYNNNNNNYY
Level 10: YNNNNNNNYN
Level 11: YYNYYNYNNY
Level 12: NYNNYNYNYN
Level 13: YNNNYNNNNN
Level 14: YYYYNYYNYN
Level 15: YYNNNNNYNY
Level 16: YNNYNYNNYN
Level 17: YNNNYNNYNN
Level 18: YNNNYNNNNN
Level 19: YNNYNNNNNY
Level 20: YYNYNYYYNN
Level 21: YYYYNNYYYN
Exam22: NNNYNNNYYN
Level 23: YNNNNYYYYY
Level 24: YYNNYYNNNY
Level 25: YNYYYNNYNN
Level 26: YYNYNYNYNN
Level 27: NYNNNNYNYN
Level 28: YNNYYYNYNN
Level 29: NNNYYNNNYN
Level 30: NYNNNNYNNN