In the earliest stages of your vocal studies, try to maintain complete mindfulness and concentration while doing these exercises. Minimize all distractions.
Gaining awareness of the areas that need the most work is the key - the differences are subtle and require close observation.
I recommend that you do the following exercises in an upright position with unencumbered breathing.
With the following scales and arpeggios:
-Sing “Bub" (with puffed "tuba" cheeks) on the lower-pitched scales & arpeggios, especially as a warmup.
-On higher scales & arpeggios, sing: “Yoo” (lips forward); “Wee”; and then “Ma” or “Ah” (these open pure vowels are quite challenging and reverting back to Yoo or Wee can help to reset).
Be interactive with the scroll-bar and repeat sections as needed.
***Remember to remain completely neutral and relaxed in the face, jaw & throat (watch in a mirror).
Don’t FORCE any notes outside of your range; just allow air to pass through the vocal cords on the highest and lowest notes that you don't feel you are able to sing comfortably. The goal is to experience an opening, allowing the notes to release freely.
When you become aware of areas in your range that feel less free (forced or constricted) or less "vertical", use the following tools to sing those passages with improved ease and tone:
-forcefully “throwing out" the highest note with your arm - baseball style.
-Sing as a quick, slurred "hweee" from the top note sliding all the way down as far as you can go.
Remember that the vocal cords are muscles and that a lot of the strength of the voice in the ”passagio,” or "bridge" areas comes from deliberate exercises that work those areas of the vocal cord-muscles in a way that haven't been exercised before. Regular exercise in a mindful way will serve to strengthen those areas of the cords and increase your range and power. Also remember that our perceptions of those notes are not entirely accurate and that the overall tone (also harmonics and overtones) sounds better than we might perceive - we must learn to trust that and re-train ourselves.
Good luck and please contact me if you have any questions or would like to further your studies.
Wishing you all the best with your singing.