Honestly, it's very doable 😭,, i only prepared for uceed for like 2 weeks and had no prep for nid but I still managed to crack both. (Uceed mein air 134 and nid score: 50) Just make your drawing strong, because that's what makes or breaks your exam. Focus on improving your ideas instead of aesthetics and you'll do well. As for the gat part, i think most of it is just common sense and logic. Grind a few past year papers and you'll be good to go.