There are six review weeks built into the Letter of the Week curriculum.  They occur on the following weeks:

Week  7 - Review A, B, C, D & E
Week 13 - Review F, G, H, I & J
Week 19 - Review K, L, M, N & O
Week 25 - Review P, Q, R, S & T
Week 32 - Review U, V, W, X, Y & Z
Week 38 - Review Long Vowels A, E, I, O & U

Each review week you will be reviewing the last 5 letters learned (except week 32 where there are 6 letters to review). Spend one day on each letter.  For example: Monday - Letter Aa, Tuesday - Letter Bb, Wednesday - Letter Cc, Thursday - Letter Dd, Friday - Letter Ee.  The week there are six letters you will need to review on Saturday as well, or review two letters on Friday.

The main purpose for review is to encourage complete mastery of the sounds of the letters.  Therefore, the main activities reviewed will be from the Language Arts portion of the curriculum.  Other activities can also be reviewed, such as music, science, snacks, and games.  I will share an example using the letter Aa.

In addition, the BeginningReading.com web site offers some great free worksheets that would be perfect to use during your review weeks.
 

Letter Aa:  (Monday)

• Post your Letter Aa poster where your child can see it throughout the day.
• Review the theme word cards.  Ask your child to tell you the sound she hears at the beginning of each word.
• Read one of the stories you read during your Aa week.  Ask your child to wave his hand every time he hears a word that begins with the short /a/ sound.
• Review the poem you shared with your child during Aa week.  This time have your child jump up and down each time she hears a word that begins with the short /a/ sound.
• Walk through your home looking for objects that start with the short /a/ sound.
• Sing the song you sang during your Aa week.
• Eat a snack from Letter Aa week.
• Play a game or look over any scrapbook/notebook pages you made for the Letter Aa.

When you reach the end of your first review week you can begin to teach your child some simple three letter words.  Put each word on an individual card and practice sounding them out.  Good words to start with include: cab, bed, dab, dad, & bad.  Then make up a "bingo" or "lotto" sheet with the words printed on it.  Call out a word and have your child find it on his sheet.  As the review weeks progress you can add more words.  You could then make up your own sentences and short stories with the words learned.  (You would have to teach some simple sight words such as: is, and, the, at, on, & to.)

Finally progress to beginning readers such as Bob Books!  Have Fun!