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CaseSingularPlural
Nominativeименительный · кто? что?успех успехи the subject: who or what acts
Accusativeвинительный · кого? что?успех успехи the direct object of the verb
Genitiveродительный · кого? чего?успеха успехов possession, absence, "of"-phrases
Dativeдательный · кому? чему?успеху успехам the receiver: to or for someone
Instrumentalтворительный · кем? чем?успехом успехами the tool or companion: with, by
Prepositionalпредложный · о ком? о чём?успехе успехах location and topics: in, at, about

Успех is a masculine noun; the ending pattern above repeats across most masculine nouns, so every table you learn makes the next one cheaper.

Look up any other word in the Russian declension tool, see where успех ranks in the most common Russian words, or start from Russian cases explained if the table above is new territory. More vocabulary lives in Russian words by topic and Russian phrases.

12 forms is a table. Using them is a skill.

Slova drills успех and every word like it with typed case endings, checked letter by letter.

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