Unlike many standard calculus textbooks (e.g., Stewart, Thomas), Zorich is a used in elite undergraduate and early graduate programs (e.g., Moscow State, École Polytechnique). Consequently, official, complete solutions do not exist — but a robust ecosystem of partial solutions, community efforts, and instructor materials does.
It sounds like you're looking for a of the solution resources available for Vladimir Zorich’s Mathematical Analysis I & II . zorich mathematical analysis solutions