I have decided to collect al these forms in one place because they are inseparable connected.
If you take ONE LOOK at ALL forms, you should be able to see that endings repeat themselves consistently. For example: accusative form of the masculine words always gets the -(e)n ending; dative form of the masculine and neuter words always gets the -(e)m ending; dative form of the feminine words always get the -(e)r ending and so on. That is why I used colours in the tables. This should help you to memorize these forms better. However, if it does not work, please feel free to bookmark this page and use it whenever you feel insecure about some of these forms.
Exercises for personal pronouns:
Exercises for possessive pronouns: