Need help with music sheets: some kids might know the answer

1. What is the function of the two double line (pencil arrow pointed, with a question mark) the last two measures before the end of this piece and how to play it? (p. 56, Level 2, The older beginner piano course by James Bastien).

2. How to play the lift (pencil arrow pointed, with a question mark) on the music sheet? (p. 6, Vol. 1, Solos for young violinists by Barbara Barber) 

Thank you very much in advance.