1. Time prepositions
http://englishpage.com/prepositions/time_prepositions_1.htm
http://englishpage.com/prepositions/time_prepositions_2.htm
2. Prepositions of location
http://englishpage.com/prepositions/location_prepositions_1.htm
http://englishpage.com/prepositions/location_prepositions_2.htm
3.Direction prepositions
http://englishpage.com/prepositions/direction_prepositions_2.htm
4. Position prepositions
http://englishpage.com/prepositions/position_prepositions_1.htm
http://englishpage.com/prepositions/position_prepositions_2.htm