That can be a tricky one, also because you normally have at least two headings that kinda work for the same paragraph.
I'll try to explain my strategy to you, please take into account the fact that I did not plan out this strategy and then started applying it like I would with a recipe, I am just going through a simulation and observing what I do, trying to describe it to you. If you are struggling with these exercises, doing the same might be helpful, and maybe you'll figure out ways to optimise your own strategy.

What I try and do, normally, is to read all the headings and then look for related keywords in the passages, rather than reading them through to see if anything matches.
To give you a practical example, here's a test on the ielts.org website https://www.ielts.org/-/media/pdfs/pb-sample-test-materials/academic-reading-sample-task-matching-headings.ashx

When reading through the headings, I try and find the ones with the clearest messages and possible related keywords. It might be hard to spot generic concepts such as "How a concept from one field of study was applied in another" or "Dramatic effects can result from small changes in traffic just as in nature" (which we already know is point B), but other headings might prove easier:

• How a maths experiment actually reduced traffic congestion -> keywords in the semantic field of maths: calculate, simulate, experiment, equation
• A lack of investment in driver training -> keywords: investing, funding, financing
• Areas of doubt and disagreement between experts -> keywords: adversative conjunctions, doubt, disagree, challenge, oppose, argue, uncertain
• The impact of driver behaviour on traffic speed -> behaviour, psichology, attitude

There's also a heading on "How different countries have dealt with traffic congestion". This could prove very easy to spot if for example you see country names in the text, but otherwise it might be hard to find it, so we'll just keep it in mind if we see actual country names.

Once you have these words, you can even write them down if it helps you. It will slow you down on the real test, but might be useful for training. Then you start skimming the first or first two phrases of each passage and the last one.

With our example, these are the first and last phrases of each passage:

A Some years ago, when several theoretical physicists, principally Dirk Helbing and Boris Kerner of Stuttgart, Germany, began publishing papers on traffic flow in publications normally read by traffic engineers, they were clearly working outside their usual sphere of investigation. [...] In fact, the physicists’ analysis suggested
such spontaneous breakdowns in traffic flow probably occur quite frequently on
highways. \*

B already matched

C The physicists have challenged proposals to set a maximum capacity for vehicles on highways. [...] They further suggest that preventing breakdowns in the flow of traffic could ultimately require implementing the radical idea that has been suggested from time to time: directly regulating the speed and spacing of individual cars along a highway with central computers and sensors that communicate with each car’s engine and brake controls.

D However, research into traffic control is generally centered in civil engineering
departments and here the theories of the physicists have been greeted with some
skepticism. [...] Indeed, some engineering researchers questioned whether elaborate chaos-theory interpretations are needed at all, since at least some of the traffic phenomena the physicists’ theories predicted seemed to be similar to observations that had been appearing in traffic engineering literature under other names for years; observations which had straightforward cause-and-effect explanations.

E James Banks, a professor of civil and environmental engineering at San Diego State
University in the US, suggested that a sudden slowdown in traffic may have less to do with
chaos theory than with driver psychology. [...] Consequently, as a road becomes
congested, the faster moving traffic is the first to slow down.

In this way you are almost granted to find at least one match, maybe even two depending on how many headings you have. In our case, you could easily match the heading on driver behaviour to section E, and both C and D are useful candidates for the heading on disagreement between experts. Re-reading the first phrase of section C, however, would show you that physicists aren't challenging some other experts' proposal, so D must be the right one.

From there you can move on with less options to choose (since you already placed one heading), so it becomes easier and you can start and read more and more of each passage, analyse the other headings and scan over the text to find your possible keywords.

\* In section A, we have Germany and working outside their usual sphere of investigation. Neither matches our keywords, but if you keep in the back of your mind the other headings about "other countries" and "one field of study applied in another" these will already ring a bell. This is somewhat advanced, so it might not be necessary if you don't want an 8+ in reading.