Technically, you are required to file a part year resident CA return for 2020 (unless your total income was less than $18, 241). Only the income received, while a CA resident is taxable, including income (eg. interest and dividends) received while a student in IL. Your NV income will not be taxable by CA, but is included in the filing requirement.
So, if you interest and dividend amount was small, you will owe little or no CA tax.
