Many of my students have a first tough barrier - they have low confidence that they can score high. The first response I usually have is - "of course you can!" That is why the mind is the most powerful tool - and I recommend suspending disbelief that they can truly improve. Usually crossing this first step is the first barrier to overcome, and it is a common challenge. That is why I believe that positive feedback mixed in with practice designed to boost their confidence is important in the early stages. It is very common to see students taking multiple SATs and ACTs only to score in the same range, and further reinforce this testing "inertia". The solution from the tutor's perspective is to prove to the students themselves that they can certainly achieve by leading them at first in small achievements, then gradually letting them maximize their potential in their own unique ways.