So, you know your way around Grade 2 scales, and you're venturing towards chromatics? You know about sharps and flats, and how they affect where you put your fingers? Well, put your knowledge to the test with this site!
Start out with a simple key, such as D major, and see if you can pick out every note shown to you. Try any other keys you should be able to get around, such as A major or B flat major. Remember that every major scale has the intervals tone-tone-semitone-tone-tone-tone-semitone, and you should be able to work up or down to unfamiliar notes from ones you're comfortable with.
Then, without needing to try to actually play the notes on the violin, go for seven flats or seven sharps, and see how many you're able to figure out, using the ones you already know as a starting point and working up or down a semitone as necessary.