This is the 15020th most frequent German word.
sech
"Sech" is not a standard German word. It may be a misspelling or abbreviation.
Here, 'sechsten' functions as an ordinal number relating to the grade level in school, derived from 'sechs' (six).
Er bekam schon in der sechsten Klasse gute Noten in Mathematik.
He already got good grades in mathematics in the sixth grade.
In this sentence, 'sechs' represents the cardinal number six, indicating a specific time of day.
Wir trafen uns um sechs Uhr am Bahnhof.
We met at six o'clock at the train station.
Here, 'Sechs' operates as a noun indicating the result of rolling a six-sided die.