I’m currently doing summer classes at the moment and my course load is too heavy. If I dropped one of my prerequisites and receive a W will my TAG be voided. I will still be able to finish that prerequisite before attending though since I plan to start at Davis Fall 2020 and will have all my courses and that dropped course finished by end Spring 2020 or Summer 2020.
Your TAG for Fall 2020 can’t be voided because it hasn’t even been submitted yet. If you decide to drop a major prep course now and will retake on or before Spring 2020 (summer is too late), you’ll be fine.
Yes you can get a W and still apply for TAG in fall. Be sure to read the Davis rules. They want full time this last spring and all of next year at a CCC, unless you have a job. I assume you were at a CCC last spring.