Learn 21 professional English expressions for confident speech at work.
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Here are the grammar books that I recommended:
"Understanding and Using English Grammar": https://amzn.to/2XU6B1j
Workbook for "Understanding and Using English Grammar": https://amzn.to/2Wd4bKE
“Advanced Grammar in Use” https://amzn.to/2Jcbc9r
“English Grammar in Use” (intermediate level): https://amzn.to/2Nn3Ncw

Here are some other excellent books for improving your English skills:

“The Ins and Outs of Prepositions”: https://amzn.to/2GPGWBh
“The Ultimate Phrasal Verbs Book”: https://amzn.to/306PlqX
"The Article Book": https://amzn.to/2GQ83fp
"Three Little Words": https://amzn.to/2GPH9o3