Here are the Last War HQ 35 minimum requirements based on the tech tree for unlocking HQ 35 in Last War: Survival Game:
HQ Level 30: Required to unlock Age of Oil tech.
Tech Center Level 30: Necessary to research Age of Oil technologies.
Special Forces at 80% or higher: A prerequisite for unlocking the Age of Oil.
Oil Well (Tier 1): This is the first requirement under Age of Oil. Only one level.
Food Output 5: Requires Oil Well (Tier 1) to start.
Iron Output 5: Requires Oil Well (Tier 1) to start.
Coin Output 5: Requires Oil Well (Tier 1) to start.
Oil Output 1: Requires Food, Iron, and Coin Output 5 at level 1. Boosts oil well output by 1% per level (10 levels total).
Fast Builder 5: Requires Oil Output 1 at level 10.
Research Enhancement 5: Requires Oil Output 1 at level 10.
Tech Center 3: Requires Fast Builder 5 and Research Enhancement 5 at level 1.
Focused Training 5: Requires Tech Center 3 at level 1.
Rapid Field Dressing 5: Requires Tech Center 3 at level 1.
Oil Output 2: Requires Focused Training 5 and Rapid Field Dressing 5 at level 1 (10 levels total).
Infirmary Expansion 5: Requires Oil Output 2 at level 10.
Emergency Capacity 5: Requires Oil Output 2 at level 10.
More Oil Wells: Requires Infirmary Expansion 5 and Emergency Capacity 5 at level 1.
Training Cost Reduction 5: Requires More Oil Wells (Tier 1).
Healing Cost Reduction 5: Requires More Oil Wells (Tier 1).
Parts Workshop: Requires Training and Healing Cost Reductions (Tier 1).
Oil Output 3: Requires Parts Workshop (10 levels total).
HQ Expansion: Requires Oil Output 3 at level 10 to unlock HQ Level 35.
You need to max out the Oil Output techs (1, 2, and 3). The resource requirements for each tech step include Iron, Food, Coin, and Oil.
Some techs need to be fully researched (like Oil Output), while others only require Level 1 completion (likeFocused Training and Field Dressing).