These are all anniversary/jubilee medals and there is no reason to fake them as they are quite common.
They are also easily identifiable with a simple internet search.
This is a good website: The Soviet Military Awards Page. Medals, History and Russia!
Fellow collectors are NOT adversaries to be bested...
☭ "Ричик, я не понимаю, почему, почему ты тратишь деньги на эти вещи!" ☭
Top left medal 70th Anniversary of the Soviet Armed Forces (1988), top right medal, 30th Anniversary of Victory (1975), bottom left medal, 50th Anniversary of the Soviet Armed Forces (1968), bottom right medal, 40th Anniversary of Victory (1985).
Medals Commemorating Victory in the Great Patriotic War of 1941-1945
Jubilee Medals for the Anniversaries of the Armed Forces of the USSR