Writing after a speaking class can help to reinforce language by enabling you to apply vocabulary you have learnt from your speaking lesson and formulating them into fully-constructed sentences.
You can then have your sentences vetted by a teacher for grammar , punctuation , choice of words and seek better ways of expressing your sentences.
Consider coupling writing classes with your speaking classes.
You may consider reflection journals for this - a 15-session lesson pack for which you will find the link below.