ATPL NAV- Need Help
 

Hi there all. I just recently took ATPL Nav and unfortunately got 61% (due to silly errors on one of the 2 and 3 markers) Anyways I wanted to ask a few questions from those that have done it recently out there.
Q1. Find the True Height:
- ALT = 4000ft/ Aerodrome elevation= 1786ft/ OAT at aerodrome= 40C and QNH=1006
- I found temp to be ISA +28-29 (using different accuracies such as 1.98C/1000ft and 2C/1000ft) Since it's asking for TH I then used 4%/10C of ISA dev therefore (8/10) x 0.04 +0.08
- That gave me around 11.2-11.6% from the different calcs, using this i found my extra height due to ISA+ conditions: 0.112 x (4000-1786) + (4000-1786)
- Ended up with 2461-2470ft none of them being answers in the casa exam. Did anyone else recieve this question at all? The answers from memory were 2425ft/2455/2475 or slightly more and something out of the question

Q2. I also got a question wrong with wx radar although ended up with 2 questions, One being to do with Attenuation and the other with light green/scallops on the radar
- For the first one I chose Cloud Refraction as the greatest form of attenuation (another close answer was range, although precip definitely attenuates signals more)
- And the 2nd I chose Light Rain and possible turbulence (Other answers included Heavy Rain and Hail, Light Rain and Hail, And something out of the question such as heavy rain and nothing else)
- I don't know which of these two I got incorrect so was just wondering of others opinions on who have done this exam already.

edit: revived a response and apparently the question I got wrong was the attenuation question which solves that problem.

Thanks for any help in advance guys, fingers crossed I don't make any silly mistakes next time and don't continue to contribute to CASA's cause of taking money off already poor pilots!