The very low, i. e. insufficient, presence of astronomy in secondary schools is evident. In order to improve the knowledge level of secondary school pupils and also to enable them to be prepared for contests inside Serbia and international ones as well as possible, the National Astronomical Olympiad Committee (NAOC) has been organising preparations as an astronomy extra-teaching. Since the proper literature, especially collections of problems, in Serbian do not exist, an effort has been done to fill these gaps, at least, partially. For that purpose the NAOC members have translated from Russian and English the most important collections and textbooks to make an easier unattended work of the pupils. An overview of the translated literature with accompanying commentary and content is given.