Hi NazymI did the MSc with LPC so came into CTA the same route as you. I am doing Advanced tech OMB & TOMC & TOMC for APS. My awareness modules were VAT, Indv & IHT.
CTA is similar to your solicitor exams. Although OMB is quite broad.
Law comes more naturally to me than tax (particularly the computational aspects) so I have to put more work in than my solicitor exams but its definitely do-able. Just dont underestimate it.