Don't just look at the final number. Trace the steps to see where your logic diverged.
Which is tripping you up (e.g., systems of equations, functions)? Are you prepping for a specific exam ? gdz algebra klass ju.n.makarychev, n.g.mindjuk, k.imeshkov
Create a "cheat sheet" for your notebook cover. Writing them down helps with muscle memory. Don't just look at the final number