12.68.6(a) . the stall is associated with a particular angle of attack and not a particular airspeed; 

The stalling angle of attack when measured using the original flaps up Chordline

12.68.6. Explain how:

12.68.4. Describe the symptoms of a developing stall.

Airspeed will be reducing
The controls become less effective
Turbulent wake casues a Buffet
Just prior to the stall the aircraft sinks – further reducing the angle of attack

12.68.2(b) . reduction of lift and increase of drag. Sub Topic Syllabus Item 

The pressure distribution below the lower surface of the aerofoil disappears at an increased angle of attack. Toward the rear there will be an area of decreased static pressure.
Lift is decreased and drag is increased as a result

12.68.2(a) . disruption of streamline flow over the upper surface of the aerofoil; 

On the upper surface of the aerofoil as the angle of attack is increased the airflow must deviate from its free-stream path and accetlerate to follow the contour of the surface. Static pressure above the wing decreases.
At the angle of attack the airflow can no longer conform so separates from most of the upper surface to form a large turbulent wake

12.68.2. Describe the stalling angle of attack, with reference to:

12.66. Turning Flight

12.66.16. Explain the effect of bank on rate of descent in a descending turn, and thetendency to underbank. 

In a descending trun the drag increases with the bank angle. If the descent is maintained the rate of descent will increase.

In a escending turn the aircraft tends to roll out = underbanking

12.66.14. Explain the effect of bank on rate of climb in a climbing turn, and the tendency tooverbank. 

As angle of attack is increased to establish a climbing turn, both lift and drag increase. If climbing speed is maintained the reduction in the rate of climb proportional to the angle of bank used

Tendency to overbank: once established in a climbing turn there is a tendency for the aircraft to continue rolling into the turn – ie overbankling

12.66.12. Describe a rate 1 turn, and a rule-of-thumb method of calculating the bank anglerequired. 

Rate 1 turn

Bank angle calculation:
For a standard rate of turn of 3 degrees per second drop the last figure from the airspeed figure and add 7
ie – if airspeed is 110 kts – bank angle is 11 =7 = 18 degrees