How to remember all the organic reactions easily?

In order to remember all the organic reactions,you have to practice them by writing.Every time when you study the reactions write down them,and focused on what is removing or what is adding.Some terms like substitution,elimination,rearrangement,dehydrogenation,dehalogenation.dehydration,halogenation etc,are very important.You should know these terms as it will help alot in understanding the reactions.Also the named reactions are very important so practice them more and more.