Does the question state what the QNH is? Without that you cannot determine your pressure altitude or anything else. Did the question start by telling you your altitude and then ask you to find the appropriate FL under VFR?
As you know, FL is just what your altimeter reads if you set standard pressure, 1013 hPa as the datum. If the pressure is, in reality, different you need to do a simple calc to find the pressure altitude (ie, how high up you actually are amsl ). Adding or subtracting 30' per 1hPa difference to give you your pressure altitude.
IIRC the exam questions usually use a higher-than-ISA-pressure to make sure the first FL is inappropriate
Eg, if the QNH is 1026 hPa with indicated alt 3000', doing the calc finds
1026 - 1013 = 13 hPa.
13 hPa x 30' = 390' difference.
As you'd wind off the datum down from 1026 to get to SPS 1013 so you take off the 390' from your altimeter reading to find pressure alt. Oh look, you are lower than you thought!
So start at the 3000' transition level, then remember that you are not ACTUALLY as high as you need to be by 390', so FL35 is not appropriate. You have to take the next appropriate FL up, depending on your magnetic track* (ie, correct your heading for any stated variation before checking whether you need to be using Odds or Evens plus 500' !).
*all the questions I've seen remain silent on Wind so assume Magnetic Heading corrected for variation is your Magnetic Track.
(It's taken me ages to type that because HeliMed was looking for a field to land in so I've curtain-twitching. They considered the one right in front of our house but the cows were in the way)