For self-study this summer

These are some examples of the practice test books available but there are dozens of them. I think you can get the following on Amazon or at Feltrinelli International, near Piazza della Repubblica:

B2 Level - Second Year level
Cambridge English: First (FCE) exam 
Get the version WITH ANSWERS and CDs
https://www.cambridge.org/bs/cambridgeenglish/catalog/cambridge-english-exams-ielts/cambridge-english-first-3/cambridge-english-first-3-students-book-answers?isbn=9781108433730&&format=PB
or
https://www.cambridge.org/bs/cambridgeenglish/catalog/cambridge-english-exams-ielts/cambridge-english-first-schools-1-revised-exam-2015/cambridge-english-first-1-schools-revised-exam-2015-authentic-examination-papers-cambridge-english-language-assessment-students-book-pack-students-book-answers-and-audio-cds-2-students-book-answers?format=PB&isbn=9781107647039

C1 Level - Third Year level
Cambridge English: Advanced (CAE)
Get the version WITH ANSWERS and CDs
https://www.amazon.it/Advanced-trainer-Practice-espansione-superiori/dp/1107470277/ref=sr_1_1?__mk_it_IT=%C3%85M%C3%85%C5%BD%C3%95%C3%91&crid=UCGD34SHD263&keywords=cambridge+advanced+trainer&qid=1560954654&s=english-books&sprefix=cambridge+a%2Cenglish-books%2C166&sr=1-1
or IELTS
Get the version WITH ANSWERS and CDs
https://www.amazon.it/IELTS-Trainer-Practice-answers-Audio-CDs/dp/3125348471/ref=asc_df_3125348471/?tag=googshopit-21&linkCode=df0&hvadid=90701175540&hvpos=1o5&hvnetw=g&hvrand=15037048480841391427&hvpone=&hvptwo=&hvqmt=&hvdev=c&hvdvcmdl=&hvlocint=&hvlocphy=9072700&hvtargid=pla-82827054540&psc=1
or
https://www.amazon.it/Cambridge-English-IELTS-Aa-Vv/dp/1316637824/ref=pd_sim_14_6/262-3781621-9004962?_encoding=UTF8&pd_rd_i=1316637824&pd_rd_r=047388d9-8e02-11e9-8327-277c7586e025&pd_rd_w=bjlaE&pd_rd_wg=UfWbH&pf_rd_p=56b3c50e-3915-4b91-b522-56dd1dac87e6&pf_rd_r=FV4YFNRDTJ6WETRECW2Q&psc=1&refRID=FV4YFNRDTJ6WETRECW2Q