Three months is a drop in the bucket. It takes time, just keep at it.

Take a scale, any scale
Set up your metronome to say 80 beats per minute
Practice that scale until you have it solid at 80 BPM
Incriment the BPM by something like 5 up to 85 BPM
Practice the scale(s) until you have it(them) down at 85 BPM
Increment the BPM by 5 again....

That's one way to build speed. But, do yourself a favor, don't move forward until you can comfortably play a scale ( or what ever type of thing you choose ) at a specific BPM... Helps to keep you from getting sloppy and lazy. ( like me :rolleyes: )