In reply to esoteric:
There is no correlation between GCSE point score (out of 10) and the climbing grade. Which exam board are you using? AQA, EdExcel and OCR are the main ones, each with their own specifications and mark schemes.
Edexcels specification is below:
The Teacher-Examiner should choose appropriate skills/manoeuvres for each candidate from the following lists, subject to the capabilities of the candidates and the weather conditions:
Safety
Fit helmet securely and check.
Fit harness/belt and check.
Tie rope to harness or clip figure of eight into karabiner and tighten gate.
Know location of nearest phone and First Aid.
Environmental issues
Impact of climbing on the environment.
Awareness of locally important species and features.
Skills/manoeuvres
Tie ‘figure of eight’ and ‘bowline’ knots with stopper knot.
Attach rope to harness/belt.
Climb, showing three points of contact.
Low level traverse.
Correct use of climbing calls.
Demonstrate how to anchor the belayer.
Belay a climber using belay device.
Assist the climber with indication of holds and route during the climb.
Perform short abseil with device and safety ropes on releasable abseil.
Demonstrate a foot jam.
Demonstrate a hand jam.
Ascend a mantle shelf.
Perform a short layback.
Belay a climber during a fall in a top roping situation.
Tie a retied figure of eight knot.
Demonstrate a multiple belay and single point belay system.
Knowledge and equipment
Ropes and storage.
Footwear.
Climbing hardware.
Rock features, eg slabs, overhangs.
Grading systems.
Improvised techniques in ropework (eg classic belay, to release jammed belay device,prussicking, Italian hitch).
Developments in the sport.
Access.
Marks 9 – 10
Candidates should be able to perform skills/manoeuvres 1-16.
Should be able to climb with style and confidence at severe grade; belay a climber in a fall situation when top roping; tie a retied figure of eight knot; demonstrate a multiple belay system. Coil rope at end of session.
Marks 7 – 8
Candidates should be able to perform skills/manoeuvres 1-13.
Should be able to climb very difficult grade; show use of jamming; show mantleshelfing and a layback; show good knowledge of the sport; abseil with confidence. Coil rope at end of session.
Marks 5 – 6
Candidates should be able to perform skills/manoeuvres 1-11.
Should be able to climb difficult grade; use correct calls; belay climber showing good use of belay device; communicate clearly with climber; abseil; show a foot jam and hand jam; show basic knowledge of sport. Coil rope at end of session.
Marks 3 – 4
Candidates should be able to perform skills/manoeuvres 1-8.
Should be able to use calls; anchor belayer; belay climber with support; communicate with climber. Stowage of rope.
Marks 1 – 2
Candidates should be able to perform skills/manoeuvres 1-4.
Should be able to tie knots safely; attach themselves to harness/belt; climb a low traverse at an easy standard. Stowage of rope.