Though its a month late you can always catch with the syllabus if you take out enough time daily for the revision. So whatever you study in your college you can revise that regularly and separate hours should be allocated to previous syllabus that has been missed. Once you revise the previous syllabus taught, having any doubts you can discuss the same the next day.

But if you do bot follow the above then the baggage will increase and neither you will be able to complete and understand the previous taught nor the new.

SO  a bit systematic in your study plan you have to be.

Good luck!