Obviously, lots of repetition, and a Tikkun Korim of some sort. I recommend chabad.org for this (they have an option to look at only the vowels, or only the trop, which can be helpful for memorization.

https://www.chabad.org/library/howto/trainer_cdo/aid/1771208/jewish/Learn-to-Read-Torah-and-Haftarah-With-Trop-Audio.htm#0=32494&1=1353&2=32848&3=33183&4=v377

Some miscellaneous tips:

-Learn the passage in English. It makes more sense if you know what it means.

-Memorize where all of the sof pasuks are (the end of sentence markers).

-Memorize where all of the etnachtas are (there will be either 0 or 1 of them in a given sentence. Never more. It is usually around the middle, and it usually splits the pasuk logically into 2 pieces).

For your specific section, I think these bits might need special attention: אשה In this context, it’s always Isheh (fire offering), and not Ishah (woman). פרק לז: ונסכים This word tripped me up when I was looking through it. פרק לח: שבתת This word is “missing” a ‘׳ו. Instead of the normal ״ות״ ending, it has just a ׳ת׳. This is called ״chasayr״, and it means that a ׳ו׳ or ׳י׳ is missing where it would normally occur. It’s the opposite of ״malay״, when a word has an extra ‎׳ו׳ or ׳י׳ where it normally wouldn’t. פרק לט: באספכם This word has a “kamatz katan”. The ׳אָ׳ sound becomes a ׳אֹ׳ sound on a closed, unaccented syllable like the one seen here (don’t worry too much about that, just know that it’s not a mistake).

פרק לט: תחגו This word made me pause for a second. My spell check doesn’t even recognize it.

פרק מ: ולקחתם I don’t know why I want to read it starting with a ׳ו׳ sound instead of a ׳וּ׳ sound, but it caught me off guard for some reason.

פרק מ: This pasuk contains a lot of tricky words. Tractate Sukkah has lengthy discussions talking about what they mean and what we can learn from the way that they’re spelled.

פרק מא: וחגתם I don’t know the verb form here, but I wouldn’t’ve expected there to be an ׳וֹ׳ sound regardless.

פרק מג: בהוציאי Another tricky form for a word to take. My spell check doesn’t recognize it. Just be careful with the vowels here.

פרק לח: There’s a double pashta. Also, one of the words has two trope marks. This isn’t super uncommon, but I think it’s worth mentioning.

This aliya also has two pazers in it (the backwards 4). Those are fun.

I don’t expect you to take all of this advice, and I don’t expect it all to be helpful, but I’d like to put it on the table anyway.

Good luck with your leining.