Hello, i would be glad if somebody could explain using suffix -in that means -to 
for example sınav=exam  sınavina = to exam 
thanks for helping 

look am gonna try

first: a/e....means to.

second:this suffix is added to the word u want to.

ex:okula gidiyorum....(okul)=school-(a) to

okula gidiyorum...am going to school.

ex 2:işe..(iş=work-(e)to

işe gidiyorum=going to work

(a) is put when the last vowel letter is(a-ı-u-o).

(e)is put whenthe last vowel letter in the word is (İ-ü-ö-e).

hope i did  sth

JulitaJ,

sınavına belongs together with the word that preceeds it in the text and together they use a compound noun, for instance Türkçe sınavına ´to the Turkish language test´.

As a sign of these nouns forming a unit sınav takes the third person possessive suffix, which in this case according to vowel harmony and other rules is -ı. The final -a is the marker of dative, meaning movement towards. What is between is the pronominal -n- which is used in third person possessive forms between the modified noun and the case marker.

sınav|ı|n|a = root|possessive suffix sg 3rd|pronominal n|dative ending

i understood how to use a/e - it shows to 
but using -n- is still not clear and maybe u can show some other examples with this ?

I had explained it here (see the 5th mesage):

http://www.turkishclass.com/forumTitle_35117