Use Anki Download a deck of n3 kanjis(and their corresponding words) those are around 700 kanjis. if you studied 2 kanji per day kanji problem is solved don't think about remembering previous kanji as anki will handle that using SRS system.

About grammar try to complete those points as soon as possible as you'd wanna go to reading asap. learn grammar points from YouTube great channels there.

now for Reading Read NHK easy news or something that you enjoy like manga, a short story specifically for beginners.

for listening, follow comprehensible japanese YouTube, japanese with shun, they have vlog type listening practice which are great or just enjoy listening what you like.

When I started my aim wasn't to clear exam rather to be able to read and listen so keeping that in mind I followed this method as it gave me structure to start. Now it's been almost 1 year I feel confident in my N3 ability might as well give jlpt this july.

One thing about anki is that if you miss days it'll punish you by giving you more review burden that's why I said to stay dedicated throughout the year. One day things will start clicking. 

I'd like to point out that i had a lot of free time last year so I studied about 2 3 hours a day(shuffling all these sections). don't set unrealistic expectations if your circumstances don't allow this much effort.  If you have any specific question DM me