Here are some links to practise and revise! :
A VS An
http://www.usingenglish.com/quizzes/302.html
A/an, The and nothing
http://www.englisch-hilfen.de/en/exercises/nouns_articles/a_the.htm
http://a4esl.org/q/h/mc001-ck.html
http://www.englishmedialab.com/Quizzes/advanced/definite%20indefinite%20article.htm
Pronouns
http://a4esl.org/q/h/vm/pronouns.html (advanced)
http://www.englishmedialab.com/Quizzes/elementary/pronouns%20choice.htm
POSSESSIVE PRONOUNS
https://www.eslgamesplus.com/possessive-pronouns-game/
How much How many?
http://a4esl.org/q/h/lb/how.html
Simple present tense (affirmative, negative and interrogative)
http://a4esl.org/q/h/lb/psv.html
https://www.englishclub.com/esl-games/grammar/jumbled-tenses-present-simple-1.htm
http://www.englishclub.com/grammar/verb-tenses_present_quiz.htm
http://www.usingenglish.com/quizzes/65.html
http://www.agendaweb.org/verbs/present-simple.html
Simple past tense (regular)
http://www.englishexercises.org/makeagame/viewgame.asp?id=4061
http://www.englishexercises.org/makeagame/viewgame.asp?id=5114
http://my-1st-eso-blog.blogspot.ca/2011/04/past-simple-regular-verbs-exercises.html (including pronunciation)
Simple past tense (irregular)
http://web2.uvcs.uvic.ca/elc/studyzone/330/grammar/irpast1.htm
http://www.eslgamesplus.com/irregular-past-tense-esl-grammar-jeopardy-quiz-game/
Simple past tense (regular and irregular)
http://www.myenglishpages.com/site_php_files/grammar-exercise-simple-past.php#.UsWCIdGA271
Negative past tense
http://web2.uvcs.uvic.ca/elc/studyzone/330/grammar/pastnq1.htm
Interrogative past tense
http://web2.uvcs.uvic.ca/elc/studyzone/330/grammar/pastnq2.htm
Singular/Plural
http://www.englishexercises.org/makeagame/viewgame.asp?id=1337
http://www.englisch-hilfen.de/en/exercises/nouns_articles/singular_plural.htm
http://www.tolearnenglish.com/exercises/exercise-english-2/exercise-english-1995.php
https://eslcastle.com/members/games/ClassroomGames/Billionaire/Plurals%20Billionair%20Game/index.htmleslcastle.com/members/games/ClassroomGames/Billionaire/Plurals%20Billionair%20Game/index.html
Adjective order
https://www.englishclub.com/grammar/adjectives-order-quiz.htm
http://esl.fis.edu/grammar/multi/adj1.htm
https://www.learnenglishfeelgood.com/esl_adjectiveorder4.html
http://a4esl.org/q/h/vm/adjorder.html
Adverbs
http://www.ego4u.com/en/cram-up/grammar/adjectives-adverbs/exercises
http://www.myenglishpages.com/site_php_files/grammar-exercise-adverbs.php#.UsWCpdGA271
http://www.grammaruntied.com/blog/?p=1560
Future tense
http://www.englisch-hilfen.de/en/exercises/tenses/future.htm
http://www.myenglishpages.com/site_php_files/grammar-exercise-simple-future.php#.UsWCz9GA271
http://www.ego4u.com/en/cram-up/grammar/future-1-will/exercises
Questions words
http://www.eslgamesplus.com/question-words-what-where-who-why-when-which-how-grammar-activity/
https://www.liveworksheets.com/worksheets/en/English_as_a_Second_Language_(ESL)/Question_words/Question_words_fc139qx
https://www.englisch-hilfen.de/en/exercises/questions/question_words2.htm
Comparative/Superlative adjectives
http://learnenglishkids.britishcouncil.org/en/grammar-games/comparatives-and-superlatives
Homophones
https://www.learninggamesforkids.com/vocabulary-games/homophones-games.html
https://www.abcya.com/games/pancake_panic_homophones
Modals
http://www.agendaweb.org/verbs/modals-exercises.html
http://www.englishpage.com/modals/interactivemodal1.htm
http://www.ecenglish.com/learnenglish/lessons/modal-verbs-practice
http://www.myenglishpages.com/site_php_files/grammar-exercise-modals.php#.UsWEHNGA271
http://www.usingenglish.com/handouts/562.html
Imperative
http://www.englishgrammarsecrets.com/imperative/menu.php
http://www.englisch-hilfen.de/en/exercises/various/imperative.htm
http://www.tolearnenglish.com/english_lessons/imperatives-exercises
Present continunous
http://www.agendaweb.org/verbs/present_continuous-exercises.html
http://www.englishexercises.org/makeagame/viewgame.asp?id=983
http://web2.uvcs.uvic.ca/courses/elc/studyzone/330/grammar/pcont1.htm
http://www.englishexercises.org/makeagame/viewgame.asp?id=1083
http://www.adelescorner.org/grammar/pres_cont/pres_cont_neg.html
Prepositions PLACE
http://www.ego4u.com/en/cram-up/grammar/prepositions/exercises?07
Prepositions TIME
http://www.ego4u.com/en/cram-up/grammar/prepositions/exercises?02
Apostrophe ''s''
www.wisc-online.com/learn/humanities/linguistics/abc601/possessive-practice
lwww.softschools.com/quizzes/grammar/possessive_nouns/quiz327.html
https://www.englisch-hilfen.de/en/exercises/nouns_articles/apostrophe_s.htm
https://www.examenglish.com/grammar/possessive_'s.htm
http://www.eflnet.com/grammar/possessives.php
http://www.english-zone.com/spelling/poss2.html
Feeling comfortable?
After 2-3 months, you'll start feeling more at ease with the English language... challenge yourself!
http://www.ecenglish.com/learnenglish/