Have you used the Oxford Learner’s Pocket Grammar? Share your favorite way to study grammar on the go in the comments below. And if you found this guide helpful, share it with a fellow English learner.
Use the PDF on your phone during "dead time"—those moments in the day where you are doing nothing, like waiting for a kettle to boil or standing in a queue. Open the PDF to a random page. Read the rule. Read the examples. Try to construct one sentence of your own using that rule. Do this three times a day, and you will have covered 21 topics in a week without setting aside dedicated "study time."
Check if your school or university provides free portal access. Legitimate Digital Libraries