Bangladesh won the Test match after a long time but in the second Test they must remember that it was because of Bangladesh's outstanding batting performance in both innings in the first Test that they were able to defeat New Zealand. But if Bangladesh can bat as well in the second test as in the first test, then they will have a chance to win the second test. In this case, as the spinners did well in the first test, they have to perform well in the second test too, then it will be possible to whitewash New Zealand in the test.
It should always be remembered that if batting, bowling and fielding are good in three areas then it is possible to win against any kind of strong team as Bangladesh proved in the first test.
Bangladesh won because they perform well both in batting and bowling. Fielding is not that much important as it is in ODI or T20I except the fact you need to be good in taking catches at slip position or near batsmen. NZ know how important second test match will be and they will try to win the match to draw the series. The last test series between both these countries played in NZ also ended in draw 1-1.