What are form interrogaties and special interrogaties

Form and Special Interrogatories are questions that a party to a lawsuit may ask the other party to answer under oath.  They are part of the discovery process in every litigation case.  The answers to the interrogatories generally must be provided within 30 days after personal service of the interrogatories or 30+5 days if served by mail.  There are penalties for failing to answer the interrogatories on time.  The answers to the interrogatories can be used to support motions submitted to the court as well as at trial.  It is important that interrogatories be answered carefully, usually with the assistance of counsel. That segues into the additional details you provided.  I am not sure what you mean by "notice," so I am assuming from the details that your lawyer is asking you to sign a Substitution of Attorney form to relieve him/her from representing you and so you can represent yourself.  This is a standard form, so there is nothing per se wrong with the lawyer asking you to sign the Substitution.  Having said that, a lawyer risks malpractice of complaints to the State Bar for abandoning a client or withdrawing for improper reasons.  This is a link to the California Rule that governs when an attorney can terminate the attorney-client relationship and for what reasons.  You may want to review this to determine if your lawyer is withdrawing for proper reasons.  Having said that, if the relationship has broken down to the point where your lawyer is asking you to sign a Substitution, then you should get a new lawyer as quickly as possible to assist you in answering the interrogatories.