Gram

Essential Grammar in Use - suplementary exercises with answer key. Elementary students

Essential grammar in use supplementary exercises from Marin

Just enough English Grammar Illustrated

Just enough english grammar illustrated from Marin

Essential Grammar in Use -with exercises & answer key. Intermediate students

Cambridge english grammar in use (intermediate) (2005) from marin

Link: Grammar Practice for Upper Intermediate Students english 
https://drive.google.com/file/d/1sPM4xnVzFFOQtZFXEepFiZVNmqTop6J7/view?usp=sharing

Placement Test online

Link: http://www.macmillanstraightforward.com/resources/tests/

Advanced Grammar in Use with exercise and Answer key

Cambridge Advanced Grammar In Use marin from marin

Dynamic & Stative Verbs with activities + answers 

LINK: https://drive.google.com/file/d/1gZ8SvY_BUdPFy6UiiA1c3jVZU5LJ7eYx/view?usp=sharing

English Idioms  with exercises and answer key

LINK: https://drive.google.com/file/d/1J8t0ADyQKADxeqejCq5XMddgo0atsJ6r/view?usp=sharing

Test your English vocabulary

LINK: https://drive.google.com/file/d/1i22SdQ-MCS9NdB1fuhp5_mwFildlchSx/view?usp=sharing

English phrasal verbs in use
Link: https://es.scribd.com/document/163110392/Phrasal-Verbs-in-Use
Phrasal Verbs in Use and other topics for Self- study & Classroom use
From matifmarin

Common mistakes at Proficiency and how to avoid them. 

LINK: https://drive.google.com/file/d/1iFZGFEp_0odu6fGkKnQ8lCPC7Qu92C5k/view?usp=sharing


Proficiency Testbuilder 4th Edition KEY 

LINK: https://drive.google.com/file/d/1dLbrifJj7e9114IXVXlRsbIwxC8UUQJq/view?usp=sharing