MOTs are also often used by unscrupulous garages as a way to drum up extra work for the workshop business. Especially if they can sense you're not mechanically minded. And it is way more these days than a basic test of roadworthyness - all sorts of emissions guff and checking of car sensors. ££££££££££
Best bet is to go early but keeping the anniversary date. Then you can go elsewhere to get fixed and not be effectively trapped into getting it repaired there. Finding a good garage you trust is key - ask around for personal recommendations.
My worst ever incident in a car was when the steering rack newly fitted for an MOT snapped on a bend. Luckily on an urban corner so got the brakes down and only just mounted the kerb. It could easily have killed me or someone else. Garage I didn't normally use but it was near work so risked it.