Unit 13: May and might

 https://test-english.com/grammar-points/a2/might-might-not/ (3 exercises in this link, click on the link on the top right corner)

Unit 13: For and since

 https://www.focus.olsztyn.pl/en-present-perfect-continuous-for-since.html

https://www.grammar.cl/Games/For_Since.htm

https://www.engblocks.com/grammar/exercises/tenses/present-perfect-since-for-exercise-2/

https://www.grammarism.com/present-perfect-with-for-since-exercises/

https://www.grammarism.com/present-perfect-with-for-since-exercises/?qid=785171

https://www.focus.olsztyn.pl/en-present-perfect-english-exercises.html

https://test-english.com/grammar-points/a2/present-perfect/   (There are 4 exercises)

Unit 12: Present perfect

 Use these links to practice:

https://www.perfect-english-grammar.com/present-perfect-exercise-1.html

https://www.perfect-english-grammar.com/present-perfect-exercise-2.html

https://www.perfect-english-grammar.com/present-perfect-exercise-3.html

https://www.perfect-english-grammar.com/present-perfect-exercise-4.html

https://www.perfect-english-grammar.com/present-perfect-exercise-5.html