I need help with NFHS Rules.

[Chitowncubfan]

I'm a rookie official in California and I have been stumped on a few true and false questions for the NFHS open book test. Any help would be great! I cannnot find explanation for these questions.
1.IT IS LEGAL EQUIPMENT FOR A PLAYER TO WEAR A BANDANNA IF IT IS FULLY COVERED BY THE HELMET.

2. IN OFFICIATING THE KICKING GAME, ONE OF THE MOST IMPORTANT RULES TO UNDERSTAND COMPLETELY IS WHEN THE KICK ENDS.

3.A PASS THROWN FROM THE 50 TOWARD THE B45, BUT BLOWN BACK BY THE WIND AND 1ST TOUCHED AT THE A45 IS A BACKWARD PASS.

4. (4TH-6 AT 50) A1 RUNS TO THE B40 AND THROWS AN INCOMPLETE FORWARD PASS. IT WILL BE A 1ST DOWN FOR A AFTER THE PENALTY.
(I'm thinking false ,but I want to make sure)

Any help with these questions would be great!!Thanks for your time!