Grammar tests

2) Preposition test
http://www.tolearnenglish.com/exercises/exercise-english-2/exercise-english-69006.php (2 mistake from 10 variants)
http://www.tolearnenglish.com/exercises/exercise-english-2/exercise-english-10086.php (9 mistake from 18 variants)

1) Word order
http://www.tolearnenglish.com/exercises/exercise-english-2/exercise-english-4267.php (3 mistake from 10 variants)
http://www.tolearnenglish.com/exercises/exercise-english-2/exercise-english-5304.php (3 mistake from 10 variants)
http://www.tolearnenglish.com/exercises/exercise-english-2/exercise-english-4274.php (0 mistake from 10 variants)
http://www.tolearnenglish.com/exercises/exercise-english-2/exercise-english-12746.php (2 mistake from 7 variants)

Summary of all possible variants:
at - 5:30 (time)
at - 8 o'clock (time)
at - weekend
at - night (part of day)
at - Christmas (holiday)
at - the moment

on - Sunday (day of week)
on - 22 November (day in calendar)
on - New Year's Day (day in calendar)
on - Monday morning (not in)

in - April (month)
in - 1985 (year)
in - spring (time of year)
in - the morning
in - holidays