Honestly, I bounced off the anime adaptation pretty hard after a couple episodes—it felt rushed and the exposition was clunky. So on a whim, I picked up the first volume of 'Mahouka Koukou no Rettousei'. The difference is night and day. The light novels take their time laying out the magic system, which is way more like a hard sci-fi framework than your typical fantasy magic. You get pages of Tatsuya explaining the principles behind activation sequences and psion waves, which sounds dry but somehow isn't. The anime had to gloss over all that, and it lost the intellectual puzzle-box appeal that makes the series unique.
If you're looking for pure, unadulterated Tatsuya worship, the novels are also your best source. The anime tones down his overwhelming competency and the sheer awe other characters feel, which is a core part of the series' charm (or frustration, depending on your taste). The prose has a certain technical, detached quality that perfectly mirrors Tatsuya's own mindset. Reading it first made revisiting the anime a more interesting experience, because I could fill in all the gaps they skipped.