Puzzle Russian Tetris No. 1

Age: +3; Country: China; Brand: World of educational toys; Packing: blister; Material: Wood; Box size, w/h/d: 27*18*1cm
The essence of the game is simple - in the minimum amount of time, fold all the geometric shapes so that they fill the entire plane. Our Tetris has 40 elements. At first glance, it is very easy. This is not true.  

And indeed it is very easy, but only until there are 4-5 elements left. And here you need to connect the logic, so to place the elements it was already necessary to disassemble what was previously assembled.