My old cat has many Many thick scabs on her back neck and base of tail. Nothing on her belly. I can pick at them and it doesn't bother her. It's getting worst as time goes by. I can't afford to take her to the vet. Please help me

If they are only in the hair, they are probably mats that forn because she may not be able to groom herself as well as she used to. If she's letting you pull them off, continue to do so, just be careful not to use scissors or damage her skin with too much pulling or anythign sharp. If her skin is affected and these are true scabs caused by some kind of lesions, she really should be seen by a vet.

If you are in financial difficulty, there are ways of still getting your pet treated by a veterinarian. Ask if they take Care Credit and apply online. This is a credit card specifically for medical, dental, and veterinary expenses.
Call a local animal shelter or college of veterinary medicine in your area and ask if they have a low- or no-cost veterinary care program. Harley’s Hope Foundation is an organization that ensures low income pet parents and their companion or service animals remain together when issues arise. Feline Veterinary Emergency Assistance (FVEAP) works with seniors, people with disabilities, people who have lost their job, good Samaritans who rescue a cat or kitten who may need financial assistance to save a beloved companion. The Feline Veterinary Emergency Assistance Program is a nonprofit 501 (c)(3) organization that provides financial assistance to cat and kitten guardians who are unable to afford veterinary services to save their companions when life-threatening illness or injury strikes. God's Creatures Ministry helps pay for veterinarian bills for those who need help. IMOM is dedicated to insure that no companion animal has to be euthanized simply because their caretaker is financially challenged. The Onyx & Breezy Foundation has many programs including helping people with medical bills. They are a good resource for information. Brown Dog Foundation provides funding to families with a sick pet that would likely respond to treatment, but due to circumstances, there is not enough money immediately available to pay. The Pet Fund and Redrover.org are great sources for help to care for your pet. The Humane Society website has many links to other organizations that help with veterinary expenses.

These scabs could be caused by scratching, and in cats, the base of the tail is a characteristic spot where cats scratch when they have fleas. If Kenchion isn't up to date on her flea treatments, I would get one now. First, I would give her Capstar. It's a one time pill that starts killing fleas within 30 minutes. Then follow up with a spot on treatment, such as Advantage or Revolution. This is a treatment that has to be used once a month. You will also have to disinfect the environment. Wash her bedding in hot soapy water, and vacuum the furniture and carpet surfaces. You can use a spray to kill fleas in the house, such as Indorex, or a flea bomb would work well to kill the fleas in the home. Hopefully, this will help clear up the scabs. If it doesn't, then she will need to see the vet. If paying for a vet is an issue, you can see if your vet accepts payment plans, if there is a low cost clinic in your area, or you can apply for Care Credit online. There is also an organization called Red Rover that give grants for treatment of sick animals, and you can see if you qualify for one of their grants.
http://www.humanesociety.org/animals/resources/tips/trouble_affording_pet.html?credit=web_id91754962 https://www.redrover.org https://www.carecredit.com