The student pilot had two dual flights in an ASK 21 glider to check out the local area since he had never flown from this airport or from a dirt runway. He received an endorsement to fly the Schweizer SG136 solo after the two dual flights; however, he had no time in this make and model, and his total time was 60 hours. He did not expect a long flight due to the wind conditions, and did not use oxygen. The departure was from runway 17. He released at 7,300 feet mean sea level, and maneuvered for about 1 1/2 hours while maintaining 9,000 to 11,000 feet. He was returning to land, but noted that the radios were garbled on occasion. He did not hear the transmission indicating that the winds had shifted, and now favored landing on runway 21. He overflew the airport, and observed the tetrahedron and windsock, which indicated that the wind was about 13 knots straight down runway 21. He said that he erroneously concluded that the wind was lighter than it was, and decided to land on runway 03, which was the only runway he had utilized during the day. The instructor had briefed him that the winds could reverse from morning to afternoon. He said that he turned base too short, and was very high. With the tail wind, he began to run out of runway. He slipped once, and then brought the glider to level. He was about 50 feet above ground level (agl) at the midpoint of the runway. He slipped hard again, and noted as he came out of the slip that he had turned the glider to the right. He flew between a hangar and a clubhouse, and the left wing tore a gash in a trailer with a glider in it. The left wing and tail sustained substantial damage. The pilot sustained cuts on both hands, abrasions on his right leg, and whip lash to his neck.